25988986521 has 81 divisors (see below), whose sum is σ = 41682646551. Its totient is φ = 15600066048.

The previous prime is 25988986501. The next prime is 25988986531. The reversal of 25988986521 is 12568988952.

The square root of 25988986521 is 161211.

It is a perfect power (a square), and thus also a powerful number.

25988986521 is a `hidden beast` number, since 25 + 9 + 8 + 8 + 9 + 86 + 521 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 1757705625 + 24231280896 = 41925^2 + 155664^2 .

It is not a de Polignac number, because 25988986521 - 2²⁵ = 25955432089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25988986501) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 238431015 + ... + 238431123.

Almost surely, 2^25988986521 is an apocalyptic number.

25988986521 is the 161211-st square number.

25988986521 is the 80606-th centered octagonal number.

It is an amenable number.

25988986521 is a deficient number, since it is larger than the sum of its proper divisors (15693660030).

25988986521 is a wasteful number, since it uses less digits than its factorization.

25988986521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 158 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 63.

The spelling of 25988986521 in words is "twenty-five billion, nine hundred eighty-eight million, nine hundred eighty-six thousand, five hundred twenty-one".