166566831876 has 81 divisors (see below), whose sum is σ = 424293723399. Its totient is φ = 55097010000.

The previous prime is 166566831829. The next prime is 166566831877. The reversal of 166566831876 is 678138665661.

The square root of 166566831876 is 408126.

It is a perfect power (a square), and thus also a powerful number.

166566831876 is a `hidden beast` number, since 1 + 66 + 566 + 8 + 3 + 1 + 8 + 7 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (166566831877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 614637621 + ... + 614637891.

Almost surely, 2^166566831876 is an apocalyptic number.

166566831876 is the 408126-th square number.

It is an amenable number.

166566831876 is an abundant number, since it is smaller than the sum of its proper divisors (257726891523).

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

166566831876 is an equidigital number, since it uses as much as digits as its factorization.

166566831876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054 (or 527 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 63.

The spelling of 166566831876 in words is "one hundred sixty-six billion, five hundred sixty-six million, eight hundred thirty-one thousand, eight hundred seventy-six".