12656331631 has 2 divisors, whose sum is σ = 12656331632. Its totient is φ = 12656331630.

The previous prime is 12656331593. The next prime is 12656331719. The reversal of 12656331631 is 13613365621.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12656331631 - 2¹³ = 12656323439 is a prime.

It is a super-2 number, since 2×12656331631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12656331131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6328165815 + 6328165816.

It is an arithmetic number, because the mean of its divisors is an integer number (6328165816).

Almost surely, 2^12656331631 is an apocalyptic number.

12656331631 is a deficient number, since it is larger than the sum of its proper divisors (1).

12656331631 is an equidigital number, since it uses as much as digits as its factorization.

12656331631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 37.

The spelling of 12656331631 in words is "twelve billion, six hundred fifty-six million, three hundred thirty-one thousand, six hundred thirty-one".