25662916665 has 32 divisors (see below), whose sum is σ = 45629612160. Its totient is φ = 13684894272.

The previous prime is 25662916649. The next prime is 25662916679. The reversal of 25662916665 is 56661926652.

It is a happy number.

It is not a de Polignac number, because 25662916665 - 2⁴ = 25662916649 is a prime.

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, 1682202 + ... + 1697388.

It is an arithmetic number, because the mean of its divisors is an integer number (1425925380).

Almost surely, 2^25662916665 is an apocalyptic number.

It is an amenable number.

25662916665 is a deficient number, since it is larger than the sum of its proper divisors (19966695495).

25662916665 is a wasteful number, since it uses less digits than its factorization.

25662916665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27718 (or 27712 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 54.

The spelling of 25662916665 in words is "twenty-five billion, six hundred sixty-two million, nine hundred sixteen thousand, six hundred sixty-five".