25687520385500 has 48 divisors (see below), whose sum is σ = 56187458780544. Its totient is φ = 10259272942400.

The previous prime is 25687520385469. The next prime is 25687520385517. The reversal of 25687520385500 is 558302578652.

It is a super-2 number, since 2×25687520385500² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

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, 39011204 + ... + 39664203.

It is an arithmetic number, because the mean of its divisors is an integer number (1170572057928).

Almost surely, 2^{25687520385500} is an apocalyptic number.

25687520385500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25687520385500 is an abundant number, since it is smaller than the sum of its proper divisors (30499938395044).

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

25687520385500 is a wasteful number, since it uses less digits than its factorization.

25687520385500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78676079 (or 78676067 counting only the distinct ones).

The product of its (nonzero) digits is 20160000, while the sum is 56.

The spelling of 25687520385500 in words is "twenty-five trillion, six hundred eighty-seven billion, five hundred twenty million, three hundred eighty-five thousand, five hundred".