166204723 has 4 divisors (see below), whose sum is σ = 174952360. Its totient is φ = 157457088.

The previous prime is 166204679. The next prime is 166204757. The reversal of 166204723 is 327402661.

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 166204723 - 2¹³ = 166196531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166204783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4373790 + ... + 4373827.

It is an arithmetic number, because the mean of its divisors is an integer number (43738090).

Almost surely, 2^166204723 is an apocalyptic number.

166204723 is a deficient number, since it is larger than the sum of its proper divisors (8747637).

166204723 is an equidigital number, since it uses as much as digits as its factorization.

166204723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8747636.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 166204723 is about 12892.0410719172. The cubic root of 166204723 is about 549.8123028945.

The spelling of 166204723 in words is "one hundred sixty-six million, two hundred four thousand, seven hundred twenty-three".