18606816566 has 16 divisors (see below), whose sum is σ = 30071050800. Its totient is φ = 8583794208.

The previous prime is 18606816443. The next prime is 18606816577. The reversal of 18606816566 is 66561860681.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

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, 107561 + ... + 220868.

It is an arithmetic number, because the mean of its divisors is an integer number (1879440675).

Almost surely, 2^18606816566 is an apocalyptic number.

18606816566 is a deficient number, since it is larger than the sum of its proper divisors (11464234234).

18606816566 is a wasteful number, since it uses less digits than its factorization.

18606816566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330623.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The spelling of 18606816566 in words is "eighteen billion, six hundred six million, eight hundred sixteen thousand, five hundred sixty-six".