166166623 has 8 divisors (see below), whose sum is σ = 193018400. Its totient is φ = 140093280.

The previous prime is 166166617. The next prime is 166166641. The reversal of 166166623 is 326661661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166166623 - 2⁹ = 166166111 is a prime.

It is a super-2 number, since 2×166166623² = 55222693198448258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166161623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194148 + ... + 195001.

It is an arithmetic number, because the mean of its divisors is an integer number (24127300).

Almost surely, 2^166166623 is an apocalyptic number.

166166623 is a deficient number, since it is larger than the sum of its proper divisors (26851777).

166166623 is an equidigital number, since it uses as much as digits as its factorization.

166166623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389217.

The product of its digits is 46656, while the sum is 37.

The square root of 166166623 is about 12890.5633313676. The cubic root of 166166623 is about 549.7702875430.

The spelling of 166166623 in words is "one hundred sixty-six million, one hundred sixty-six thousand, six hundred twenty-three".