18994912534 has 16 divisors (see below), whose sum is σ = 31673900160. Its totient is φ = 8484079680.

The previous prime is 18994912483. The next prime is 18994912567. The reversal of 18994912534 is 43521949981.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11782639 + ... + 11784250.

It is an arithmetic number, because the mean of its divisors is an integer number (1979618760).

Almost surely, 2^18994912534 is an apocalyptic number.

18994912534 is a deficient number, since it is larger than the sum of its proper divisors (12678987626).

18994912534 is a wasteful number, since it uses less digits than its factorization.

18994912534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23566935.

The product of its digits is 2799360, while the sum is 55.

The spelling of 18994912534 in words is "eighteen billion, nine hundred ninety-four million, nine hundred twelve thousand, five hundred thirty-four".