166665164 has 24 divisors (see below), whose sum is σ = 299595408. Its totient is φ = 81077760.

The previous prime is 166665157. The next prime is 166665167. The reversal of 166665164 is 461566661.

It is a super-2 number, since 2×166665164² = 55554553782293792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (166665167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69839 + ... + 72185.

It is an arithmetic number, because the mean of its divisors is an integer number (12483142).

Almost surely, 2^166665164 is an apocalyptic number.

It is an amenable number.

166665164 is a deficient number, since it is larger than the sum of its proper divisors (132930244).

166665164 is a wasteful number, since it uses less digits than its factorization.

166665164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2825 (or 2823 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 166665164 is about 12909.8862891971. The cubic root of 166665164 is about 550.3195542455.

The spelling of 166665164 in words is "one hundred sixty-six million, six hundred sixty-five thousand, one hundred sixty-four".