12556135331 has 4 divisors (see below), whose sum is σ = 12556487664. Its totient is φ = 12555783000.

The previous prime is 12556135301. The next prime is 12556135343. The reversal of 12556135331 is 13353165521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13353165521 = 139 ⋅96065939.

It is a cyclic number.

It is not a de Polignac number, because 12556135331 - 2¹⁰ = 12556134307 is a prime.

It is a super-2 number, since 2×12556135331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12556135291 and 12556135300.

It is not an unprimeable number, because it can be changed into a prime (12556135301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115820 + ... + 196281.

It is an arithmetic number, because the mean of its divisors is an integer number (3139121916).

Almost surely, 2^12556135331 is an apocalyptic number.

12556135331 is a deficient number, since it is larger than the sum of its proper divisors (352333).

12556135331 is an equidigital number, since it uses as much as digits as its factorization.

12556135331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352332.

The product of its digits is 40500, while the sum is 35.

The spelling of 12556135331 in words is "twelve billion, five hundred fifty-six million, one hundred thirty-five thousand, three hundred thirty-one".