165807713 has 4 divisors (see below), whose sum is σ = 173016768. Its totient is φ = 158598660.

The previous prime is 165807709. The next prime is 165807721. The reversal of 165807713 is 317708561.

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 165807713 - 2² = 165807709 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165807743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3604493 + ... + 3604538.

It is an arithmetic number, because the mean of its divisors is an integer number (43254192).

Almost surely, 2^165807713 is an apocalyptic number.

It is an amenable number.

165807713 is a deficient number, since it is larger than the sum of its proper divisors (7209055).

165807713 is an equidigital number, since it uses as much as digits as its factorization.

165807713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7209054.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 165807713 is about 12876.6343817008. The cubic root of 165807713 is about 549.3741785327.

The spelling of 165807713 in words is "one hundred sixty-five million, eight hundred seven thousand, seven hundred thirteen".