166564423 has 8 divisors (see below), whose sum is σ = 168687792. Its totient is φ = 164449536.

The previous prime is 166564421. The next prime is 166564471. The reversal of 166564423 is 324465661.

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 166564423 - 2¹ = 166564421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166564421) 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, 43461 + ... + 47137.

It is an arithmetic number, because the mean of its divisors is an integer number (21085974).

Almost surely, 2^166564423 is an apocalyptic number.

166564423 is a deficient number, since it is larger than the sum of its proper divisors (2123369).

166564423 is an equidigital number, since it uses as much as digits as its factorization.

166564423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4241.

The product of its digits is 103680, while the sum is 37.

The square root of 166564423 is about 12905.9839996801. The cubic root of 166564423 is about 550.2086514132.

The spelling of 166564423 in words is "one hundred sixty-six million, five hundred sixty-four thousand, four hundred twenty-three".