665170 has 16 divisors (see below), whose sum is σ = 1306368. Its totient is φ = 241840.

The previous prime is 665153. The next prime is 665177. The reversal of 665170 is 71566.

It is a super-2 number, since 2×665170² = 884902257800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665177) by changing a digit.

665170 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2914 + ... + 3133.

It is an arithmetic number, because the mean of its divisors is an integer number (81648).

2⁶⁶⁵¹⁷⁰ is an apocalyptic number.

665170 is a deficient number, since it is larger than the sum of its proper divisors (641198).

665170 is a wasteful number, since it uses less digits than its factorization.

665170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6065.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 665170 is about 815.5795485420. The cubic root of 665170 is about 87.2926245537.

It can be divided in two parts, 665 and 170, that multiplied together give a triangular number (113050 = T₄₇₅).

The spelling of 665170 in words is "six hundred sixty-five thousand, one hundred seventy".