25664511631 has 4 divisors (see below), whose sum is σ = 27997649064. Its totient is φ = 23331374200.

The previous prime is 25664511629. The next prime is 25664511667. The reversal of 25664511631 is 13611546652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25664511631 - 2¹ = 25664511629 is a prime.

It is a super-2 number, since 2×25664511631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25664512631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1166568700 + ... + 1166568721.

It is an arithmetic number, because the mean of its divisors is an integer number (6999412266).

Almost surely, 2^25664511631 is an apocalyptic number.

25664511631 is a deficient number, since it is larger than the sum of its proper divisors (2333137433).

25664511631 is a wasteful number, since it uses less digits than its factorization.

25664511631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333137432.

The product of its digits is 129600, while the sum is 40.

The spelling of 25664511631 in words is "twenty-five billion, six hundred sixty-four million, five hundred eleven thousand, six hundred thirty-one".