25643805164 has 24 divisors (see below), whose sum is σ = 47807739840. Its totient is φ = 12000712464.

The previous prime is 25643805157. The next prime is 25643805167. The reversal of 25643805164 is 46150834652.

It is not an unprimeable number, because it can be changed into a prime (25643805167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2026334 + ... + 2038949.

It is an arithmetic number, because the mean of its divisors is an integer number (1991989160).

Almost surely, 2^25643805164 is an apocalyptic number.

It is an amenable number.

25643805164 is a deficient number, since it is larger than the sum of its proper divisors (22163934676).

25643805164 is a wasteful number, since it uses less digits than its factorization.

25643805164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4065389 (or 4065387 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 25643805164 in words is "twenty-five billion, six hundred forty-three million, eight hundred five thousand, one hundred sixty-four".