1256427655252 has 96 divisors (see below), whose sum is σ = 2817392497920. Its totient is φ = 475947601920.

The previous prime is 1256427655187. The next prime is 1256427655267. The reversal of 1256427655252 is 2525567246521.

It is a super-2 number, since 2×1256427655252² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1256427655252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16246308 + ... + 16323460.

It is an arithmetic number, because the mean of its divisors is an integer number (29347838520).

Almost surely, 2^{1256427655252} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256427655252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1408696248960).

1256427655252 is an abundant number, since it is smaller than the sum of its proper divisors (1560964842668).

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

1256427655252 is a wasteful number, since it uses less digits than its factorization.

1256427655252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78641 (or 78639 counting only the distinct ones).

The product of its digits is 10080000, while the sum is 52.

The spelling of 1256427655252 in words is "one trillion, two hundred fifty-six billion, four hundred twenty-seven million, six hundred fifty-five thousand, two hundred fifty-two".