25523866500 has 96 divisors (see below), whose sum is σ = 81082415232. Its totient is φ = 6187600000.

The previous prime is 25523866499. The next prime is 25523866531. The reversal of 25523866500 is 566832552.

It is a super-2 number, since 2×25523866500² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 756951 + ... + 789950.

It is an arithmetic number, because the mean of its divisors is an integer number (844608492).

Almost surely, 2^25523866500 is an apocalyptic number.

25523866500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25523866500 is an abundant number, since it is smaller than the sum of its proper divisors (55558548732).

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

25523866500 is a wasteful number, since it uses less digits than its factorization.

25523866500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546934 (or 1546922 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 25523866500 in words is "twenty-five billion, five hundred twenty-three million, eight hundred sixty-six thousand, five hundred".