18885666556 has 12 divisors (see below), whose sum is σ = 33051420360. Its totient is φ = 9442403600.

The previous prime is 18885666539. The next prime is 18885666557. The reversal of 18885666556 is 65566658881.

It is a super-2 number, since 2×18885666556² (a number of 21 digits) contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4410 + ... + 194398.

It is an arithmetic number, because the mean of its divisors is an integer number (2754285030).

Almost surely, 2^18885666556 is an apocalyptic number.

It is an amenable number.

18885666556 is a deficient number, since it is larger than the sum of its proper divisors (14165753804).

18885666556 is a wasteful number, since it uses less digits than its factorization.

18885666556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214844 (or 214842 counting only the distinct ones).

The product of its digits is 82944000, while the sum is 64.

The spelling of 18885666556 in words is "eighteen billion, eight hundred eighty-five million, six hundred sixty-six thousand, five hundred fifty-six".