18866774636 has 12 divisors (see below), whose sum is σ = 33909203328. Its totient is φ = 9178430832.

The previous prime is 18866774629. The next prime is 18866774653. The reversal of 18866774636 is 63647766881.

It is a super-2 number, since 2×18866774636² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63738956 + ... + 63739251.

It is an arithmetic number, because the mean of its divisors is an integer number (2825766944).

Almost surely, 2^18866774636 is an apocalyptic number.

It is an amenable number.

18866774636 is a deficient number, since it is larger than the sum of its proper divisors (15042428692).

18866774636 is a wasteful number, since it uses less digits than its factorization.

18866774636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127478248 (or 127478246 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 62.

The spelling of 18866774636 in words is "eighteen billion, eight hundred sixty-six million, seven hundred seventy-four thousand, six hundred thirty-six".