18666552428 has 24 divisors (see below), whose sum is σ = 34101144672. Its totient is φ = 8923711104.

The previous prime is 18666552397. The next prime is 18666552433. The reversal of 18666552428 is 82425566681.

It is a self number, because there is not a number n which added to its sum of digits gives 18666552428.

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, 182576 + ... + 265832.

It is an arithmetic number, because the mean of its divisors is an integer number (1420881028).

Almost surely, 2^18666552428 is an apocalyptic number.

It is an amenable number.

18666552428 is a deficient number, since it is larger than the sum of its proper divisors (15434592244).

18666552428 is a wasteful number, since it uses less digits than its factorization.

18666552428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85721 (or 85719 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 53.

The spelling of 18666552428 in words is "eighteen billion, six hundred sixty-six million, five hundred fifty-two thousand, four hundred twenty-eight".