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25000000000 = 29511
BaseRepresentation
bin10111010010000111…
…011011101000000000
32101112021220120210221
4113102013123220000
5402200000000000
615252420432424
71543344331243
oct272207335000
971467816727
1025000000000
11a669937028
124a18548714
132485536511
1412d238725a
159b4bc261a
hex5d21dba00

25000000000 has 120 divisors (see below), whose sum is σ = 62438964588. Its totient is φ = 10000000000.

The previous prime is 24999999991. The next prime is 25000000013. The reversal of 25000000000 is 52.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 6 ways, for example, as 3749357824 + 21250642176 = 61232^2 + 145776^2 .

It is a sliding number, since 25000000000 = 5000000000 + 20000000000 and 1/5000000000 + 1/20000000000 = 0.00000000025000000000.

It is a hoax number, since the sum of its digits (7) coincides with the sum of the digits of its distinct prime factors.

It is an enlightened number because it begins with the concatenation of its prime factors (25).

It is a self number, because there is not a number n which added to its sum of digits gives 25000000000.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4999999998 + ... + 5000000002.

Almost surely, 225000000000 is an apocalyptic number.

25000000000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25000000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31219482294).

25000000000 is an abundant number, since it is smaller than the sum of its proper divisors (37438964588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25000000000 is an frugal number, since it uses more digits than its factorization.

25000000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 7.

Multiplying 25000000000 by its product of nonzero digits (10), we get a square (250000000000 = 5000002).

25000000000 divided by its product of nonzero digits (10) gives a square (2500000000 = 500002).

Adding to 25000000000 its reverse (52), we get a palindrome (25000000052).

It can be divided in two parts, 2 and 5000000000, that multiplied together give a 10-th power (10000000000 = 1010).

The spelling of 25000000000 in words is "twenty-five billion", and thus it is an aban number and an uban number.

Divisors: 1 2 4 5 8 10 16 20 25 32 40 50 64 80 100 125 128 160 200 250 256 320 400 500 512 625 640 800 1000 1250 1280 1600 2000 2500 2560 3125 3200 4000 5000 6250 6400 8000 10000 12500 12800 15625 16000 20000 25000 31250 32000 40000 50000 62500 64000 78125 80000 100000 125000 156250 160000 200000 250000 312500 320000 390625 400000 500000 625000 781250 800000 1000000 1250000 1562500 1600000 1953125 2000000 2500000 3125000 3906250 4000000 5000000 6250000 7812500 8000000 9765625 10000000 12500000 15625000 19531250 20000000 25000000 31250000 39062500 40000000 48828125 50000000 62500000 78125000 97656250 100000000 125000000 156250000 195312500 200000000 250000000 312500000 390625000 500000000 625000000 781250000 1000000000 1250000000 1562500000 2500000000 3125000000 5000000000 6250000000 12500000000 25000000000