18679938554 has 4 divisors (see below), whose sum is σ = 28019907834. Its totient is φ = 9339969276.

The previous prime is 18679938503. The next prime is 18679938647. The reversal of 18679938554 is 45583997681.

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., 18568150225 + 111788329 = 136265^2 + 10573^2 .

It is a super-2 number, since 2×18679938554² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4669984637 + ... + 4669984640.

Almost surely, 2^18679938554 is an apocalyptic number.

18679938554 is a deficient number, since it is larger than the sum of its proper divisors (9339969280).

18679938554 is an equidigital number, since it uses as much as digits as its factorization.

18679938554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9339969279.

The product of its digits is 65318400, while the sum is 65.

The spelling of 18679938554 in words is "eighteen billion, six hundred seventy-nine million, nine hundred thirty-eight thousand, five hundred fifty-four".