1256951326256 has 80 divisors (see below), whose sum is σ = 2577092103168. Its totient is φ = 592966483200.

The previous prime is 1256951326237. The next prime is 1256951326273. The reversal of 1256951326256 is 6526231596521.

It is a junction number, because it is equal to n+sod(n) for n = 1256951326198 and 1256951326207.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11612546 + ... + 11720286.

Almost surely, 2^{1256951326256} is an apocalyptic number.

1256951326256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256951326256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1288546051584).

1256951326256 is an abundant number, since it is smaller than the sum of its proper divisors (1320140776912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256951326256 is a wasteful number, since it uses less digits than its factorization.

1256951326256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108370 (or 108364 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 53.

The spelling of 1256951326256 in words is "one trillion, two hundred fifty-six billion, nine hundred fifty-one million, three hundred twenty-six thousand, two hundred fifty-six".