18999999999994 has 32 divisors (see below), whose sum is σ = 30721263264720. Its totient is φ = 8760960786432.

The previous prime is 18999999999947. The next prime is 19000000000043. The reversal of 18999999999994 is 49999999999981.

It can be written as a sum of positive squares in 8 ways, for example, as 16156098886225 + 2843901113769 = 4019465^2 + 1686387^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157056522 + ... + 157177450.

Almost surely, 2^{18999999999994} is an apocalyptic number.

18999999999994 is a deficient number, since it is larger than the sum of its proper divisors (11721263264726).

18999999999994 is a wasteful number, since it uses less digits than its factorization.

18999999999994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126594.

The product of its digits is 1004193907488, while the sum is 112.

The spelling of 18999999999994 in words is "eighteen trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-four".