25698654864 has 225 divisors, whose sum is σ = 76668748299. Its totient is φ = 8310366720.

The previous prime is 25698654853. The next prime is 25698654899. The reversal of 25698654864 is 46845689652.

The square root of 25698654864 is 160308.

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

25698654864 is a `hidden beast` number, since 2 + 5 + 6 + 9 + 86 + 548 + 6 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6707610000 + 18991044864 = 81900^2 + 137808^2 .

Its product of digits (99532800) is a multiple of the sum of its prime factors (288).

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 352036332 + ... + 352036404.

Almost surely, 2^25698654864 is an apocalyptic number.

25698654864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

25698654864 is the 160308-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25698654864

25698654864 is an abundant number, since it is smaller than the sum of its proper divisors (50970093435).

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

25698654864 is an frugal number, since it uses more digits than its factorization.

25698654864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 139 counting only the distinct ones).

The product of its digits is 99532800, while the sum is 63.

The spelling of 25698654864 in words is "twenty-five billion, six hundred ninety-eight million, six hundred fifty-four thousand, eight hundred sixty-four".