1256057256856 has 8 divisors (see below), whose sum is σ = 2355107356620. Its totient is φ = 628028628424.

The previous prime is 1256057256851. The next prime is 1256057256871. The reversal of 1256057256856 is 6586527506521.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1256057256856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256057256851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78503578546 + ... + 78503578561.

Almost surely, 2^{1256057256856} is an apocalyptic number.

It is an amenable number.

1256057256856 is a deficient number, since it is larger than the sum of its proper divisors (1099050099764).

1256057256856 is a wasteful number, since it uses less digits than its factorization.

1256057256856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157007157113 (or 157007157109 counting only the distinct ones).

The product of its (nonzero) digits is 30240000, while the sum is 58.

The spelling of 1256057256856 in words is "one trillion, two hundred fifty-six billion, fifty-seven million, two hundred fifty-six thousand, eight hundred fifty-six".