166155005 has 4 divisors (see below), whose sum is σ = 199386012. Its totient is φ = 132924000.

The previous prime is 166154987. The next prime is 166155043. The reversal of 166155005 is 500551661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44582329 + 121572676 = 6677^2 + 11026^2 .

It is not a de Polignac number, because 166155005 - 2⁶ = 166154941 is a prime.

It is a Duffinian number.

It is a congruent 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, 16615496 + ... + 16615505.

It is an arithmetic number, because the mean of its divisors is an integer number (49846503).

Almost surely, 2^166155005 is an apocalyptic number.

It is an amenable number.

166155005 is a deficient number, since it is larger than the sum of its proper divisors (33231007).

166155005 is an equidigital number, since it uses as much as digits as its factorization.

166155005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33231006.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 166155005 is about 12890.1126837588. The cubic root of 166155005 is about 549.7574743399.

The spelling of 166155005 in words is "one hundred sixty-six million, one hundred fifty-five thousand, five".