665715 has 8 divisors (see below), whose sum is σ = 1065168. Its totient is φ = 355040.

The previous prime is 665713. The next prime is 665719. The reversal of 665715 is 517566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665715 - 2¹ = 665713 is a prime.

It is a super-2 number, since 2×665715² = 886352922450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22176 + ... + 22205.

It is an arithmetic number, because the mean of its divisors is an integer number (133146).

2⁶⁶⁵⁷¹⁵ is an apocalyptic number.

665715 is a deficient number, since it is larger than the sum of its proper divisors (399453).

665715 is a wasteful number, since it uses less digits than its factorization.

665715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44389.

The product of its digits is 6300, while the sum is 30.

The square root of 665715 is about 815.9135983669. The cubic root of 665715 is about 87.3164588081.

The spelling of 665715 in words is "six hundred sixty-five thousand, seven hundred fifteen".