165215215 has 12 divisors (see below), whose sum is σ = 217921032. Its totient is φ = 120156080.

The previous prime is 165215201. The next prime is 165215221. The reversal of 165215215 is 512512561.

It is not a de Polignac number, because 165215215 - 2⁷ = 165215087 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 11 ways as a sum of consecutive naturals, for example, 135937 + ... + 137146.

It is an arithmetic number, because the mean of its divisors is an integer number (18160086).

Almost surely, 2^165215215 is an apocalyptic number.

165215215 is a deficient number, since it is larger than the sum of its proper divisors (52705817).

165215215 is a wasteful number, since it uses less digits than its factorization.

165215215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273110 (or 273099 counting only the distinct ones).

The product of its digits is 3000, while the sum is 28.

The square root of 165215215 is about 12853.6070812827. The cubic root of 165215215 is about 548.7190188385.

Adding to 165215215 its reverse (512512561), we get a palindrome (677727776).

It can be divided in two parts, 16521 and 5215, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 165215215 in words is "one hundred sixty-five million, two hundred fifteen thousand, two hundred fifteen".