665255607 has 32 divisors (see below), whose sum is σ = 946176000. Its totient is φ = 414592992.

The previous prime is 665255599. The next prime is 665255609. The reversal of 665255607 is 706552566.

It is a happy number.

It is not a de Polignac number, because 665255607 - 2³ = 665255599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665255609) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2529358 + ... + 2529620.

It is an arithmetic number, because the mean of its divisors is an integer number (29568000).

Almost surely, 2^665255607 is an apocalyptic number.

665255607 is a deficient number, since it is larger than the sum of its proper divisors (280920393).

665255607 is a wasteful number, since it uses less digits than its factorization.

665255607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707.

The product of its (nonzero) digits is 378000, while the sum is 42.

The square root of 665255607 is about 25792.5494474664. The cubic root of 665255607 is about 872.9636923004.

The spelling of 665255607 in words is "six hundred sixty-five million, two hundred fifty-five thousand, six hundred seven".