1256945880836 has 24 divisors (see below), whose sum is σ = 2201199624960. Its totient is φ = 628031840832.

The previous prime is 1256945880793. The next prime is 1256945880857. The reversal of 1256945880836 is 6380885496521.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors.

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, 46777541 + ... + 46804403.

It is an arithmetic number, because the mean of its divisors is an integer number (91716651040).

Almost surely, 2^{1256945880836} is an apocalyptic number.

It is an amenable number.

1256945880836 is a deficient number, since it is larger than the sum of its proper divisors (944253744124).

1256945880836 is a wasteful number, since it uses less digits than its factorization.

1256945880836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34643 (or 34641 counting only the distinct ones).

The product of its (nonzero) digits is 99532800, while the sum is 65.

The spelling of 1256945880836 in words is "one trillion, two hundred fifty-six billion, nine hundred forty-five million, eight hundred eighty thousand, eight hundred thirty-six".