25210000000 has 128 divisors (see below), whose sum is σ = 62803550160. Its totient is φ = 10080000000.

The previous prime is 25209999977. The next prime is 25210000021. The reversal of 25210000000 is 1252.

It can be written as a sum of positive squares in 8 ways, for example, as 25006994496 + 203005504 = 158136^2 + 14248^2 .

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9998740 + ... + 10001260.

Almost surely, 2^25210000000 is an apocalyptic number.

25210000000 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 25210000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31401775080).

25210000000 is an abundant number, since it is smaller than the sum of its proper divisors (37593550160).

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

25210000000 is an frugal number, since it uses more digits than its factorization.

25210000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2570 (or 2528 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

Adding to 25210000000 its reverse (1252), we get a palindrome (25210001252).

The spelling of 25210000000 in words is "twenty-five billion, two hundred ten million", and thus it is an aban number.