25515902568 has 192 divisors, whose sum is σ = 71131426560. Its totient is φ = 7620108288.

The previous prime is 25515902563. The next prime is 25515902591. The reversal of 25515902568 is 86520951552.

It is a super-2 number, since 2×25515902568² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25515902563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26116096 + ... + 26117072.

It is an arithmetic number, because the mean of its divisors is an integer number (370476180).

Almost surely, 2^25515902568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25515902568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35565713280).

25515902568 is an abundant number, since it is smaller than the sum of its proper divisors (45615523992).

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

25515902568 is a wasteful number, since it uses less digits than its factorization.

25515902568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196 (or 1179 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 48.

The spelling of 25515902568 in words is "twenty-five billion, five hundred fifteen million, nine hundred two thousand, five hundred sixty-eight".