166687166 has 16 divisors (see below), whose sum is σ = 253039488. Its totient is φ = 82344600.

The previous prime is 166687139. The next prime is 166687201. The reversal of 166687166 is 661786661.

It is a super-2 number, since 2×166687166² = 55569222618223112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166687166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141761 + ... + 142931.

It is an arithmetic number, because the mean of its divisors is an integer number (15814968).

Almost surely, 2^166687166 is an apocalyptic number.

166687166 is a deficient number, since it is larger than the sum of its proper divisors (86352322).

166687166 is a wasteful number, since it uses less digits than its factorization.

166687166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1967.

The product of its digits is 435456, while the sum is 47.

The square root of 166687166 is about 12910.7383987129. The cubic root of 166687166 is about 550.3437696599.

The spelling of 166687166 in words is "one hundred sixty-six million, six hundred eighty-seven thousand, one hundred sixty-six".