166599366858 has 12 divisors (see below), whose sum is σ = 360965294898. Its totient is φ = 55533122280.

The previous prime is 166599366847. The next prime is 166599366863. The reversal of 166599366858 is 858663995661.

166599366858 is a `hidden beast` number, since 166 + 59 + 9 + 366 + 8 + 58 = 666.

It can be written as a sum of positive squares in only one way, i.e., 162282482649 + 4316884209 = 402843^2 + 65703^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4627760173 + ... + 4627760208.

Almost surely, 2^166599366858 is an apocalyptic number.

166599366858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

166599366858 is an abundant number, since it is smaller than the sum of its proper divisors (194365928040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166599366858 is a wasteful number, since it uses less digits than its factorization.

166599366858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9255520389 (or 9255520386 counting only the distinct ones).

The product of its digits is 503884800, while the sum is 72.

The spelling of 166599366858 in words is "one hundred sixty-six billion, five hundred ninety-nine million, three hundred sixty-six thousand, eight hundred fifty-eight".