18944055631 has 2 divisors, whose sum is σ = 18944055632. Its totient is φ = 18944055630.

The previous prime is 18944055589. The next prime is 18944055661. The reversal of 18944055631 is 13655044981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18944055631 - 2¹⁵ = 18944022863 is a prime.

It is a super-2 number, since 2×18944055631² (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 (18944055661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9472027815 + 9472027816.

It is an arithmetic number, because the mean of its divisors is an integer number (9472027816).

Almost surely, 2^18944055631 is an apocalyptic number.

18944055631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18944055631 is an equidigital number, since it uses as much as digits as its factorization.

18944055631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 18944055631 in words is "eighteen billion, nine hundred forty-four million, fifty-five thousand, six hundred thirty-one".