18666657812 has 48 divisors (see below), whose sum is σ = 36895971840. Its totient is φ = 8186572800.

The previous prime is 18666657767. The next prime is 18666657833. The reversal of 18666657812 is 21875666681.

It is a super-2 number, since 2×18666657812² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 439364 + ... + 479972.

It is an arithmetic number, because the mean of its divisors is an integer number (768666080).

Almost surely, 2^18666657812 is an apocalyptic number.

It is an amenable number.

18666657812 is a deficient number, since it is larger than the sum of its proper divisors (18229314028).

18666657812 is a wasteful number, since it uses less digits than its factorization.

18666657812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40992 (or 40990 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 56.

The spelling of 18666657812 in words is "eighteen billion, six hundred sixty-six million, six hundred fifty-seven thousand, eight hundred twelve".