18885666558 has 32 divisors (see below), whose sum is σ = 41605155072. Its totient is φ = 5667364800.

The previous prime is 18885666557. The next prime is 18885666601. The reversal of 18885666558 is 85566658881.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18885666557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1382263 + ... + 1395858.

It is an arithmetic number, because the mean of its divisors is an integer number (1300161096).

Almost surely, 2^18885666558 is an apocalyptic number.

18885666558 is an abundant number, since it is smaller than the sum of its proper divisors (22719488514).

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

18885666558 is a wasteful number, since it uses less digits than its factorization.

18885666558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778240.

The product of its digits is 110592000, while the sum is 66.

The spelling of 18885666558 in words is "eighteen billion, eight hundred eighty-five million, six hundred sixty-six thousand, five hundred fifty-eight".