12536643331 has 2 divisors, whose sum is σ = 12536643332. Its totient is φ = 12536643330.

The previous prime is 12536643271. The next prime is 12536643389. The reversal of 12536643331 is 13334663521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12536643331 - 2²⁷ = 12402425603 is a prime.

It is a super-2 number, since 2×12536643331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12536643391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6268321665 + 6268321666.

It is an arithmetic number, because the mean of its divisors is an integer number (6268321666).

Almost surely, 2^12536643331 is an apocalyptic number.

12536643331 is a deficient number, since it is larger than the sum of its proper divisors (1).

12536643331 is an equidigital number, since it uses as much as digits as its factorization.

12536643331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 37.

The spelling of 12536643331 in words is "twelve billion, five hundred thirty-six million, six hundred forty-three thousand, three hundred thirty-one".