12640165288 has 8 divisors (see below), whose sum is σ = 23700309930. Its totient is φ = 6320082640.

The previous prime is 12640165267. The next prime is 12640165297. The reversal of 12640165288 is 88256104621.

It can be written as a sum of positive squares in only one way, i.e., 11466554724 + 1173610564 = 107082^2 + 34258^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 790010323 + ... + 790010338.

Almost surely, 2^12640165288 is an apocalyptic number.

It is an amenable number.

12640165288 is a deficient number, since it is larger than the sum of its proper divisors (11060144642).

12640165288 is a wasteful number, since it uses less digits than its factorization.

12640165288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580020667 (or 1580020663 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 12640165288 in words is "twelve billion, six hundred forty million, one hundred sixty-five thousand, two hundred eighty-eight".