1256117477135 has 16 divisors (see below), whose sum is σ = 1586967189600. Its totient is φ = 951829335936.

The previous prime is 1256117477123. The next prime is 1256117477141. The reversal of 1256117477135 is 5317747116521.

It is a cyclic number.

It is not a de Polignac number, because 1256117477135 - 2¹⁴ = 1256117460751 is a prime.

It is a super-2 number, since 2×1256117477135² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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, 699440 + ... + 1732469.

It is an arithmetic number, because the mean of its divisors is an integer number (99185449350).

Almost surely, 2^{1256117477135} is an apocalyptic number.

1256117477135 is a deficient number, since it is larger than the sum of its proper divisors (330849712465).

1256117477135 is a wasteful number, since it uses less digits than its factorization.

1256117477135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2437370.

The product of its digits is 1234800, while the sum is 50.

The spelling of 1256117477135 in words is "one trillion, two hundred fifty-six billion, one hundred seventeen million, four hundred seventy-seven thousand, one hundred thirty-five".