660365 has 12 divisors (see below), whose sum is σ = 843636. Its totient is φ = 496128.

The previous prime is 660349. The next prime is 660367. The reversal of 660365 is 563066.

It can be written as a sum of positive squares in 6 ways, for example, as 114244 + 546121 = 338^2 + 739^2 .

It is not a de Polignac number, because 660365 - 2⁴ = 660349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660365.

It is not an unprimeable number, because it can be changed into a prime (660367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1217 + ... + 1673.

It is an arithmetic number, because the mean of its divisors is an integer number (70303).

2⁶⁶⁰³⁶⁵ is an apocalyptic number.

It is an amenable number.

660365 is a deficient number, since it is larger than the sum of its proper divisors (183271).

660365 is a wasteful number, since it uses less digits than its factorization.

660365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 479 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 660365 is about 812.6284513848. The cubic root of 660365 is about 87.0819239767.

The spelling of 660365 in words is "six hundred sixty thousand, three hundred sixty-five".