165245917 has 4 divisors (see below), whose sum is σ = 166355100. Its totient is φ = 164136736.

The previous prime is 165245879. The next prime is 165245929. The reversal of 165245917 is 719542561.

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 13734436 + 151511481 = 3706^2 + 12309^2 .

It is a cyclic number.

It is not a de Polignac number, because 165245917 - 2⁷ = 165245789 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 165245917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165245957) 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, 554368 + ... + 554665.

It is an arithmetic number, because the mean of its divisors is an integer number (41588775).

Almost surely, 2^165245917 is an apocalyptic number.

It is an amenable number.

165245917 is a deficient number, since it is larger than the sum of its proper divisors (1109183).

165245917 is a wasteful number, since it uses less digits than its factorization.

165245917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109182.

The product of its digits is 75600, while the sum is 40.

The square root of 165245917 is about 12854.8013209073. The cubic root of 165245917 is about 548.7530062811.

The spelling of 165245917 in words is "one hundred sixty-five million, two hundred forty-five thousand, nine hundred seventeen".