12718821637631 has 2 divisors, whose sum is σ = 12718821637632. Its totient is φ = 12718821637630.

The previous prime is 12718821637619. The next prime is 12718821637673. The reversal of 12718821637631 is 13673612881721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12718821637631 - 2⁴² = 8320775126527 is a prime.

It is a super-2 number, since 2×12718821637631² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12718821637331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6359410818815 + 6359410818816.

It is an arithmetic number, because the mean of its divisors is an integer number (6359410818816).

Almost surely, 2^{12718821637631} is an apocalyptic number.

12718821637631 is a deficient number, since it is larger than the sum of its proper divisors (1).

12718821637631 is an equidigital number, since it uses as much as digits as its factorization.

12718821637631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 56.

The spelling of 12718821637631 in words is "twelve trillion, seven hundred eighteen billion, eight hundred twenty-one million, six hundred thirty-seven thousand, six hundred thirty-one".