18881672668631 has 2 divisors, whose sum is σ = 18881672668632. Its totient is φ = 18881672668630.

The previous prime is 18881672668589. The next prime is 18881672668667. The reversal of 18881672668631 is 13686627618881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18881672668631 - 2¹⁰ = 18881672667607 is a prime.

It is a super-2 number, since 2×18881672668631² (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 (18881672668531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9440836334315 + 9440836334316.

It is an arithmetic number, because the mean of its divisors is an integer number (9440836334316).

Almost surely, 2^{18881672668631} is an apocalyptic number.

18881672668631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18881672668631 is an equidigital number, since it uses as much as digits as its factorization.

18881672668631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 222953472, while the sum is 71.

The spelling of 18881672668631 in words is "eighteen trillion, eight hundred eighty-one billion, six hundred seventy-two million, six hundred sixty-eight thousand, six hundred thirty-one".