25765545420 has 96 divisors (see below), whose sum is σ = 80503899840. Its totient is φ = 6841290240.

The previous prime is 25765545413. The next prime is 25765545431. The reversal of 25765545420 is 2454556752.

25765545420 is a `hidden beast` number, since 2 + 5 + 7 + 65 + 545 + 42 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23430 + ... + 228210.

It is an arithmetic number, because the mean of its divisors is an integer number (838582290).

Almost surely, 2^25765545420 is an apocalyptic number.

25765545420 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 25765545420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40251949920).

25765545420 is an abundant number, since it is smaller than the sum of its proper divisors (54738354420).

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

25765545420 is a wasteful number, since it uses less digits than its factorization.

25765545420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205032 (or 205024 counting only the distinct ones).

The product of its (nonzero) digits is 1680000, while the sum is 45.

The spelling of 25765545420 in words is "twenty-five billion, seven hundred sixty-five million, five hundred forty-five thousand, four hundred twenty".