18538716999 has 32 divisors (see below), whose sum is σ = 28148152320. Its totient is φ = 10750924800.

The previous prime is 18538716983. The next prime is 18538717013. The reversal of 18538716999 is 99961783581.

It is not a de Polignac number, because 18538716999 - 2⁴ = 18538716983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18538716799) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10762 + ... + 192855.

It is an arithmetic number, because the mean of its divisors is an integer number (879629760).

Almost surely, 2^18538716999 is an apocalyptic number.

18538716999 is a deficient number, since it is larger than the sum of its proper divisors (9609435321).

18538716999 is a wasteful number, since it uses less digits than its factorization.

18538716999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203751.

The product of its digits is 29393280, while the sum is 66.

It can be divided in two parts, 18538 and 716999, that added together give a palindrome (735537).

The spelling of 18538716999 in words is "eighteen billion, five hundred thirty-eight million, seven hundred sixteen thousand, nine hundred ninety-nine".