165418217 has 4 divisors (see below), whose sum is σ = 165459600. Its totient is φ = 165376836.

The previous prime is 165418181. The next prime is 165418223. The reversal of 165418217 is 712814561.

165418217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165418217 - 2²² = 161223913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165414217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13967 + ... + 22932.

It is an arithmetic number, because the mean of its divisors is an integer number (41364900).

Almost surely, 2^165418217 is an apocalyptic number.

It is an amenable number.

165418217 is a deficient number, since it is larger than the sum of its proper divisors (41383).

165418217 is an equidigital number, since it uses as much as digits as its factorization.

165418217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41382.

The product of its digits is 13440, while the sum is 35.

The square root of 165418217 is about 12861.5013509310. The cubic root of 165418217 is about 548.9436661606.

The spelling of 165418217 in words is "one hundred sixty-five million, four hundred eighteen thousand, two hundred seventeen".