18631402872469 has 2 divisors, whose sum is σ = 18631402872470. Its totient is φ = 18631402872468.

The previous prime is 18631402872457. The next prime is 18631402872473. The reversal of 18631402872469 is 96427820413681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17003004840900 + 1628398031569 = 4123470^2 + 1276087^2 .

It is a cyclic number.

It is not a de Polignac number, because 18631402872469 - 2²³ = 18631394483861 is a prime.

It is a super-2 number, since 2×18631402872469² (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 (18631402872479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9315701436234 + 9315701436235.

It is an arithmetic number, because the mean of its divisors is an integer number (9315701436235).

Almost surely, 2^{18631402872469} is an apocalyptic number.

It is an amenable number.

18631402872469 is a deficient number, since it is larger than the sum of its proper divisors (1).

18631402872469 is an equidigital number, since it uses as much as digits as its factorization.

18631402872469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27869184, while the sum is 61.

The spelling of 18631402872469 in words is "eighteen trillion, six hundred thirty-one billion, four hundred two million, eight hundred seventy-two thousand, four hundred sixty-nine".