665907 has 16 divisors (see below), whose sum is σ = 1026432. Its totient is φ = 379520.

The previous prime is 665897. The next prime is 665921. The reversal of 665907 is 709566.

It is a cyclic number.

It is not a de Polignac number, because 665907 - 2⁶ = 665843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (665947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (64152).

2⁶⁶⁵⁹⁰⁷ is an apocalyptic number.

665907 is a deficient number, since it is larger than the sum of its proper divisors (360525).

665907 is a wasteful number, since it uses less digits than its factorization.

665907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 665907 is about 816.0312494016. The cubic root of 665907 is about 87.3248523642.

The spelling of 665907 in words is "six hundred sixty-five thousand, nine hundred seven".