18393661434 has 16 divisors (see below), whose sum is σ = 37305455040. Its totient is φ = 6044865120.

The previous prime is 18393661421. The next prime is 18393661469. The reversal of 18393661434 is 43416639381.

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, 21588379 + ... + 21589230.

It is an arithmetic number, because the mean of its divisors is an integer number (2331590940).

Almost surely, 2^18393661434 is an apocalyptic number.

18393661434 is an abundant number, since it is smaller than the sum of its proper divisors (18911793606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18393661434 is a wasteful number, since it uses less digits than its factorization.

18393661434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43177685.

The product of its digits is 1119744, while the sum is 48.

The spelling of 18393661434 in words is "eighteen billion, three hundred ninety-three million, six hundred sixty-one thousand, four hundred thirty-four".