18923686558 has 16 divisors (see below), whose sum is σ = 32461188480. Its totient is φ = 8105005656.

The previous prime is 18923686549. The next prime is 18923686583. The reversal of 18923686558 is 85568632981.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18923686496 and 18923686505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405916 + ... + 450127.

It is an arithmetic number, because the mean of its divisors is an integer number (2028824280).

Almost surely, 2^18923686558 is an apocalyptic number.

18923686558 is a deficient number, since it is larger than the sum of its proper divisors (13537501922).

18923686558 is a wasteful number, since it uses less digits than its factorization.

18923686558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857631.

The product of its digits is 24883200, while the sum is 61.

The spelling of 18923686558 in words is "eighteen billion, nine hundred twenty-three million, six hundred eighty-six thousand, five hundred fifty-eight".