18139911554 has 8 divisors (see below), whose sum is σ = 27252318348. Its totient is φ = 9055805440.

The previous prime is 18139911529. The next prime is 18139911617. The reversal of 18139911554 is 45511993181.

It can be written as a sum of positive squares in 2 ways, for example, as 15167154025 + 2972757529 = 123155^2 + 54523^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18139911499 and 18139911508.

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, 7073567 + ... + 7076130.

Almost surely, 2^18139911554 is an apocalyptic number.

18139911554 is a deficient number, since it is larger than the sum of its proper divisors (9112406794).

18139911554 is a wasteful number, since it uses less digits than its factorization.

18139911554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14150340.

The product of its digits is 194400, while the sum is 47.

The spelling of 18139911554 in words is "eighteen billion, one hundred thirty-nine million, nine hundred eleven thousand, five hundred fifty-four".