166004155 has 4 divisors (see below), whose sum is σ = 199204992. Its totient is φ = 132803320.

The previous prime is 166004081. The next prime is 166004171. The reversal of 166004155 is 551400661.

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

It is not a de Polignac number, because 166004155 - 2¹⁵ = 165971387 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16600411 + ... + 16600420.

It is an arithmetic number, because the mean of its divisors is an integer number (49801248).

Almost surely, 2^166004155 is an apocalyptic number.

166004155 is a deficient number, since it is larger than the sum of its proper divisors (33200837).

166004155 is an equidigital number, since it uses as much as digits as its factorization.

166004155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33200836.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 166004155 is about 12884.2599709879. The cubic root of 166004155 is about 549.5910513764.

The spelling of 166004155 in words is "one hundred sixty-six million, four thousand, one hundred fifty-five".