18947328538 has 8 divisors (see below), whose sum is σ = 28696925088. Its totient is φ = 9381686844.

The previous prime is 18947328511. The next prime is 18947328541. The reversal of 18947328538 is 83582374981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45988456 + ... + 45988867.

It is an arithmetic number, because the mean of its divisors is an integer number (3587115636).

Almost surely, 2^18947328538 is an apocalyptic number.

18947328538 is a deficient number, since it is larger than the sum of its proper divisors (9749596550).

18947328538 is a wasteful number, since it uses less digits than its factorization.

18947328538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91977428.

The product of its digits is 11612160, while the sum is 58.

The spelling of 18947328538 in words is "eighteen billion, nine hundred forty-seven million, three hundred twenty-eight thousand, five hundred thirty-eight".