25613406665 has 96 divisors (see below), whose sum is σ = 41279673600. Its totient is φ = 15122419200.

The previous prime is 25613406661. The next prime is 25613406667. The reversal of 25613406665 is 56660431652.

It is not a de Polignac number, because 25613406665 - 2² = 25613406661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25613406661) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6808385 + ... + 6812145.

It is an arithmetic number, because the mean of its divisors is an integer number (429996600).

Almost surely, 2^25613406665 is an apocalyptic number.

It is an amenable number.

25613406665 is a deficient number, since it is larger than the sum of its proper divisors (15666266935).

25613406665 is a wasteful number, since it uses less digits than its factorization.

25613406665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3836 (or 3803 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 25613406665 in words is "twenty-five billion, six hundred thirteen million, four hundred six thousand, six hundred sixty-five".