166659923 has 4 divisors (see below), whose sum is σ = 166713288. Its totient is φ = 166606560.

The previous prime is 166659917. The next prime is 166659929. The reversal of 166659923 is 329956661.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (166659917) and next prime (166659929).

It is a cyclic number.

It is not a de Polignac number, because 166659923 - 2²² = 162465619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166659929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21686 + ... + 28347.

It is an arithmetic number, because the mean of its divisors is an integer number (41678322).

Almost surely, 2^166659923 is an apocalyptic number.

166659923 is a deficient number, since it is larger than the sum of its proper divisors (53365).

166659923 is an equidigital number, since it uses as much as digits as its factorization.

166659923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53364.

The product of its digits is 524880, while the sum is 47.

The square root of 166659923 is about 12909.6833036291. The cubic root of 166659923 is about 550.3137856834.

The spelling of 166659923 in words is "one hundred sixty-six million, six hundred fifty-nine thousand, nine hundred twenty-three".