18512933921519 has 2 divisors, whose sum is σ = 18512933921520. Its totient is φ = 18512933921518.

The previous prime is 18512933921509. The next prime is 18512933921627. The reversal of 18512933921519 is 91512933921581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18512933921519 - 2²⁰ = 18512932872943 is a prime.

It is a super-2 number, since 2×18512933921519² (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 (18512933921509) 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, 9256466960759 + 9256466960760.

It is an arithmetic number, because the mean of its divisors is an integer number (9256466960760).

Almost surely, 2^{18512933921519} is an apocalyptic number.

18512933921519 is a deficient number, since it is larger than the sum of its proper divisors (1).

18512933921519 is an equidigital number, since it uses as much as digits as its factorization.

18512933921519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5248800, while the sum is 59.

The spelling of 18512933921519 in words is "eighteen trillion, five hundred twelve billion, nine hundred thirty-three million, nine hundred twenty-one thousand, five hundred nineteen".