18138959010631 has 2 divisors, whose sum is σ = 18138959010632. Its totient is φ = 18138959010630.

The previous prime is 18138959010617. The next prime is 18138959010647. The reversal of 18138959010631 is 13601095983181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18138959010631 - 2⁹ = 18138959010119 is a prime.

It is a super-2 number, since 2×18138959010631² (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 (18138959010691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9069479505315 + 9069479505316.

It is an arithmetic number, because the mean of its divisors is an integer number (9069479505316).

Almost surely, 2^{18138959010631} is an apocalyptic number.

18138959010631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18138959010631 is an equidigital number, since it uses as much as digits as its factorization.

18138959010631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 55.

The spelling of 18138959010631 in words is "eighteen trillion, one hundred thirty-eight billion, nine hundred fifty-nine million, ten thousand, six hundred thirty-one".