166599123201 has 24 divisors (see below), whose sum is σ = 275245776000. Its totient is φ = 95121614016.

The previous prime is 166599123193. The next prime is 166599123247. The reversal of 166599123201 is 102321995661.

166599123201 is a `hidden beast` number, since 16 + 6 + 599 + 1 + 23 + 20 + 1 = 666.

It is not a de Polignac number, because 166599123201 - 2³ = 166599123193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166599123001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1004076 + ... + 1158173.

It is an arithmetic number, because the mean of its divisors is an integer number (11468574000).

Almost surely, 2^166599123201 is an apocalyptic number.

It is an amenable number.

166599123201 is a deficient number, since it is larger than the sum of its proper divisors (108646652799).

166599123201 is a wasteful number, since it uses less digits than its factorization.

166599123201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163485 (or 2163482 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 166599123201 in words is "one hundred sixty-six billion, five hundred ninety-nine million, one hundred twenty-three thousand, two hundred one".