18912408874 has 4 divisors (see below), whose sum is σ = 28368613314. Its totient is φ = 9456204436.

The previous prime is 18912408847. The next prime is 18912408887. The reversal of 18912408874 is 47880421981.

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., 18250118649 + 662290225 = 135093^2 + 25735^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4728102217 + ... + 4728102220.

Almost surely, 2^18912408874 is an apocalyptic number.

18912408874 is a deficient number, since it is larger than the sum of its proper divisors (9456204440).

18912408874 is an equidigital number, since it uses as much as digits as its factorization.

18912408874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9456204439.

The product of its (nonzero) digits is 1032192, while the sum is 52.

The spelling of 18912408874 in words is "eighteen billion, nine hundred twelve million, four hundred eight thousand, eight hundred seventy-four".