18669391018 has 8 divisors (see below), whose sum is σ = 28011664260. Its totient is φ = 9332169600.

The previous prime is 18669391003. The next prime is 18669391021. The reversal of 18669391018 is 81019396681.

It can be written as a sum of positive squares in 2 ways, for example, as 18447887329 + 221503689 = 135823^2 + 14883^2 .

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, 1253703 + ... + 1268506.

Almost surely, 2^18669391018 is an apocalyptic number.

18669391018 is a deficient number, since it is larger than the sum of its proper divisors (9342273242).

18669391018 is a wasteful number, since it uses less digits than its factorization.

18669391018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525912.

The product of its (nonzero) digits is 559872, while the sum is 52.

The spelling of 18669391018 in words is "eighteen billion, six hundred sixty-nine million, three hundred ninety-one thousand, eighteen".