18463558666 has 16 divisors (see below), whose sum is σ = 31723274304. Its totient is φ = 7895088864.

The previous prime is 18463558639. The next prime is 18463558667. The reversal of 18463558666 is 66685536481.

It is a super-2 number, since 2×18463558666² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18463558666.

It is not an unprimeable number, because it can be changed into a prime (18463558667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1482315 + ... + 1494718.

It is an arithmetic number, because the mean of its divisors is an integer number (1982704644).

Almost surely, 2^18463558666 is an apocalyptic number.

18463558666 is a deficient number, since it is larger than the sum of its proper divisors (13259715638).

18463558666 is a wasteful number, since it uses less digits than its factorization.

18463558666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2977485.

The product of its digits is 24883200, while the sum is 58.

The spelling of 18463558666 in words is "eighteen billion, four hundred sixty-three million, five hundred fifty-eight thousand, six hundred sixty-six".