12556334531 has 4 divisors (see below), whose sum is σ = 13522206432. Its totient is φ = 11590462632.

The previous prime is 12556334507. The next prime is 12556334533. The reversal of 12556334531 is 13543365521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13543365521 = 7 ⋅1934766503.

It is a cyclic number.

It is not a de Polignac number, because 12556334531 - 2¹⁴ = 12556318147 is a prime.

It is a super-2 number, since 2×12556334531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12556334533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482935931 + ... + 482935956.

It is an arithmetic number, because the mean of its divisors is an integer number (3380551608).

Almost surely, 2^12556334531 is an apocalyptic number.

12556334531 is a deficient number, since it is larger than the sum of its proper divisors (965871901).

12556334531 is an equidigital number, since it uses as much as digits as its factorization.

12556334531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965871900.

The product of its digits is 162000, while the sum is 38.

The spelling of 12556334531 in words is "twelve billion, five hundred fifty-six million, three hundred thirty-four thousand, five hundred thirty-one".