165278879 has 4 divisors (see below), whose sum is σ = 175001184. Its totient is φ = 155556576.

The previous prime is 165278849. The next prime is 165278881. The reversal of 165278879 is 978872561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165278879 - 2⁸ = 165278623 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 165278879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165278819) 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, 4861127 + ... + 4861160.

It is an arithmetic number, because the mean of its divisors is an integer number (43750296).

Almost surely, 2^165278879 is an apocalyptic number.

165278879 is a deficient number, since it is larger than the sum of its proper divisors (9722305).

165278879 is an equidigital number, since it uses as much as digits as its factorization.

165278879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9722304.

The product of its digits is 1693440, while the sum is 53.

The square root of 165278879 is about 12856.0833460273. The cubic root of 165278879 is about 548.7894908821.

The spelling of 165278879 in words is "one hundred sixty-five million, two hundred seventy-eight thousand, eight hundred seventy-nine".