166550155 has 4 divisors (see below), whose sum is σ = 199860192. Its totient is φ = 133240120.

The previous prime is 166550149. The next prime is 166550179. The reversal of 166550155 is 551055661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551055661 = 13 ⋅42388897.

It is not a de Polignac number, because 166550155 - 2⁵ = 166550123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166550155.

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, 16655011 + ... + 16655020.

It is an arithmetic number, because the mean of its divisors is an integer number (49965048).

Almost surely, 2^166550155 is an apocalyptic number.

166550155 is a deficient number, since it is larger than the sum of its proper divisors (33310037).

166550155 is an equidigital number, since it uses as much as digits as its factorization.

166550155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33310036.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 166550155 is about 12905.4312210015. The cubic root of 166550155 is about 550.1929405728.

The spelling of 166550155 in words is "one hundred sixty-six million, five hundred fifty thousand, one hundred fifty-five".