18219974658 has 32 divisors (see below), whose sum is σ = 37855080960. Its totient is φ = 5839966080.

The previous prime is 18219974599. The next prime is 18219974687. The reversal of 18219974658 is 85647991281.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282763 + ... + 341166.

It is an arithmetic number, because the mean of its divisors is an integer number (1182971280).

Almost surely, 2^18219974658 is an apocalyptic number.

18219974658 is an abundant number, since it is smaller than the sum of its proper divisors (19635106302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18219974658 is a wasteful number, since it uses less digits than its factorization.

18219974658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624122.

The product of its digits is 8709120, while the sum is 60.

The spelling of 18219974658 in words is "eighteen billion, two hundred nineteen million, nine hundred seventy-four thousand, six hundred fifty-eight".