165813379 has 4 divisors (see below), whose sum is σ = 166399576. Its totient is φ = 165227184.

The previous prime is 165813377. The next prime is 165813413. The reversal of 165813379 is 973318561.

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 165813379 - 2¹ = 165813377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165813377) 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, 292674 + ... + 293239.

It is an arithmetic number, because the mean of its divisors is an integer number (41599894).

Almost surely, 2^165813379 is an apocalyptic number.

165813379 is a deficient number, since it is larger than the sum of its proper divisors (586197).

165813379 is an equidigital number, since it uses as much as digits as its factorization.

165813379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586196.

The product of its digits is 136080, while the sum is 43.

The square root of 165813379 is about 12876.8543907276. The cubic root of 165813379 is about 549.3804362204.

The spelling of 165813379 in words is "one hundred sixty-five million, eight hundred thirteen thousand, three hundred seventy-nine".