25998520464 has 120 divisors (see below), whose sum is σ = 83190032640. Its totient is φ = 7424930304.

The previous prime is 25998520459. The next prime is 25998520487. The reversal of 25998520464 is 46402589952.

25998520464 is a `hidden beast` number, since 2 + 59 + 9 + 8 + 520 + 4 + 64 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 25998520464.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3279097 + ... + 3287015.

It is an arithmetic number, because the mean of its divisors is an integer number (693250272).

Almost surely, 2^25998520464 is an apocalyptic number.

25998520464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25998520464 is an abundant number, since it is smaller than the sum of its proper divisors (57191512176).

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

25998520464 is a wasteful number, since it uses less digits than its factorization.

25998520464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11197 (or 11188 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 25998520464 in words is "twenty-five billion, nine hundred ninety-eight million, five hundred twenty thousand, four hundred sixty-four".