1256313257507 has 16 divisors (see below), whose sum is σ = 1570339180800. Its totient is φ = 976428803040.

The previous prime is 1256313257491. The next prime is 1256313257509. The reversal of 1256313257507 is 7057523136521.

It is a cyclic number.

It is not a de Polignac number, because 1256313257507 - 2⁴ = 1256313257491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256313257509) 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, 20941457 + ... + 21001362.

It is an arithmetic number, because the mean of its divisors is an integer number (98146198800).

Almost surely, 2^{1256313257507} is an apocalyptic number.

1256313257507 is a deficient number, since it is larger than the sum of its proper divisors (314025923293).

1256313257507 is a wasteful number, since it uses less digits than its factorization.

1256313257507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41943226.

The product of its (nonzero) digits is 1323000, while the sum is 47.

The spelling of 1256313257507 in words is "one trillion, two hundred fifty-six billion, three hundred thirteen million, two hundred fifty-seven thousand, five hundred seven".