166500023 has 4 divisors (see below), whose sum is σ = 176294160. Its totient is φ = 156705888.

The previous prime is 166500011. The next prime is 166500029. The reversal of 166500023 is 320005661.

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

It is a cyclic number.

It is not a de Polignac number, because 166500023 - 2²² = 162305719 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 (166500029) 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 3 ways as a sum of consecutive naturals, for example, 4897043 + ... + 4897076.

It is an arithmetic number, because the mean of its divisors is an integer number (44073540).

Almost surely, 2^166500023 is an apocalyptic number.

166500023 is a deficient number, since it is larger than the sum of its proper divisors (9794137).

166500023 is an equidigital number, since it uses as much as digits as its factorization.

166500023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9794136.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 166500023 is about 12903.4887917958. The cubic root of 166500023 is about 550.1377318973.

Adding to 166500023 its reverse (320005661), we get a palindrome (486505684).

The spelling of 166500023 in words is "one hundred sixty-six million, five hundred thousand, twenty-three".