1256040008164 has 24 divisors (see below), whose sum is σ = 2262189061440. Its totient is φ = 609869122464.

The previous prime is 1256040008161. The next prime is 1256040008173. The reversal of 1256040008164 is 4618000406521.

It is not an unprimeable number, because it can be changed into a prime (1256040008161) 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, 21075904 + ... + 21135415.

It is an arithmetic number, because the mean of its divisors is an integer number (94257877560).

Almost surely, 2^{1256040008164} is an apocalyptic number.

It is an amenable number.

1256040008164 is a deficient number, since it is larger than the sum of its proper divisors (1006149053276).

1256040008164 is a wasteful number, since it uses less digits than its factorization.

1256040008164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42211539 (or 42211537 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 1256040008164 in words is "one trillion, two hundred fifty-six billion, forty million, eight thousand, one hundred sixty-four".