18697233994 has 4 divisors (see below), whose sum is σ = 28045850994. Its totient is φ = 9348616996.

The previous prime is 18697233979. The next prime is 18697234001. The reversal of 18697233994 is 49933279681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14259942225 + 4437291769 = 119415^2 + 66613^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4674308497 + ... + 4674308500.

Almost surely, 2^18697233994 is an apocalyptic number.

18697233994 is a deficient number, since it is larger than the sum of its proper divisors (9348617000).

18697233994 is an equidigital number, since it uses as much as digits as its factorization.

18697233994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9348616999.

The product of its digits is 17635968, while the sum is 61.

The spelling of 18697233994 in words is "eighteen billion, six hundred ninety-seven million, two hundred thirty-three thousand, nine hundred ninety-four".