665755 has 8 divisors (see below), whose sum is σ = 816192. Its totient is φ = 521088.

The previous prime is 665747. The next prime is 665761. The reversal of 665755 is 557566.

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

It is a cyclic number.

It is not a de Polignac number, because 665755 - 2³ = 665747 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 665755.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1182 + ... + 1651.

It is an arithmetic number, because the mean of its divisors is an integer number (102024).

2⁶⁶⁵⁷⁵⁵ is an apocalyptic number.

665755 is a deficient number, since it is larger than the sum of its proper divisors (150437).

665755 is a wasteful number, since it uses less digits than its factorization.

665755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885.

The product of its digits is 31500, while the sum is 34.

The square root of 665755 is about 815.9381103981. The cubic root of 665755 is about 87.3182075987.

The spelling of 665755 in words is "six hundred sixty-five thousand, seven hundred fifty-five".