25641715764 has 48 divisors (see below), whose sum is σ = 68442472448. Its totient is φ = 7319287008.

The previous prime is 25641715747. The next prime is 25641715777. The reversal of 25641715764 is 46751714652.

It is a super-2 number, since 2×25641715764² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54292 + ... + 232875.

Almost surely, 2^25641715764 is an apocalyptic number.

It is an amenable number.

25641715764 is an abundant number, since it is smaller than the sum of its proper divisors (42800756684).

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

25641715764 is a wasteful number, since it uses less digits than its factorization.

25641715764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288244 (or 288242 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 48.

The spelling of 25641715764 in words is "twenty-five billion, six hundred forty-one million, seven hundred fifteen thousand, seven hundred sixty-four".