165222255 has 16 divisors (see below), whose sum is σ = 288388224. Its totient is φ = 80107680.

The previous prime is 165222241. The next prime is 165222257. The reversal of 165222255 is 552222561.

It is not a de Polignac number, because 165222255 - 2⁵ = 165222223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165222257) 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 15 ways as a sum of consecutive naturals, for example, 500509 + ... + 500838.

It is an arithmetic number, because the mean of its divisors is an integer number (18024264).

Almost surely, 2^165222255 is an apocalyptic number.

165222255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165222255 is a deficient number, since it is larger than the sum of its proper divisors (123165969).

165222255 is a wasteful number, since it uses less digits than its factorization.

165222255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001366.

The product of its digits is 12000, while the sum is 30.

The square root of 165222255 is about 12853.8809314541. The cubic root of 165222255 is about 548.7268125659.

It can be divided in two parts, 165222 and 255, that multiplied together give a triangular number (42131610 = T₉₁₇₉).

The spelling of 165222255 in words is "one hundred sixty-five million, two hundred twenty-two thousand, two hundred fifty-five".