665150317 has 18 divisors (see below), whose sum is σ = 751229486. Its totient is φ = 585401520.

The previous prime is 665150261. The next prime is 665150333. The reversal of 665150317 is 713051566.

It can be written as a sum of positive squares in only one way, i.e., 460488681 + 204661636 = 21459^2 + 14306^2 .

It is not a de Polignac number, because 665150317 - 2¹¹ = 665148269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665150357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2138592 + ... + 2138902.

Almost surely, 2^665150317 is an apocalyptic number.

It is an amenable number.

665150317 is a deficient number, since it is larger than the sum of its proper divisors (86079169).

665150317 is an equidigital number, since it uses as much as digits as its factorization.

665150317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 665150317 is about 25790.5082733939. The cubic root of 665150317 is about 872.9176352181.

The spelling of 665150317 in words is "six hundred sixty-five million, one hundred fifty thousand, three hundred seventeen".