1256171315204 has 24 divisors (see below), whose sum is σ = 2367477110208. Its totient is φ = 579752439840.

The previous prime is 1256171315171. The next prime is 1256171315251. The reversal of 1256171315204 is 4025131716521.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1280609 + ... + 2037719.

It is an arithmetic number, because the mean of its divisors is an integer number (98644879592).

Almost surely, 2^{1256171315204} is an apocalyptic number.

It is an amenable number.

1256171315204 is a deficient number, since it is larger than the sum of its proper divisors (1111305795004).

1256171315204 is a wasteful number, since it uses less digits than its factorization.

1256171315204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789035 (or 789033 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 1256171315204 in words is "one trillion, two hundred fifty-six billion, one hundred seventy-one million, three hundred fifteen thousand, two hundred four".