25640768868 has 48 divisors (see below), whose sum is σ = 70287986496. Its totient is φ = 7172242560.

The previous prime is 25640768863. The next prime is 25640768917. The reversal of 25640768868 is 86886704652.

It is not an unprimeable number, because it can be changed into a prime (25640768863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7469371 + ... + 7472802.

It is an arithmetic number, because the mean of its divisors is an integer number (1464333052).

Almost surely, 2^25640768868 is an apocalyptic number.

It is an amenable number.

25640768868 is an abundant number, since it is smaller than the sum of its proper divisors (44647217628).

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

25640768868 is a wasteful number, since it uses less digits than its factorization.

25640768868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14942204 (or 14942202 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 60.

The spelling of 25640768868 in words is "twenty-five billion, six hundred forty million, seven hundred sixty-eight thousand, eight hundred sixty-eight".