660520313 has 16 divisors (see below), whose sum is σ = 707097600. Its totient is φ = 615177360.

The previous prime is 660520297. The next prime is 660520349. The reversal of 660520313 is 313025066.

It is a cyclic number.

It is not a de Polignac number, because 660520313 - 2⁴ = 660520297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660520013) 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, 888620 + ... + 889362.

It is an arithmetic number, because the mean of its divisors is an integer number (44193600).

Almost surely, 2^660520313 is an apocalyptic number.

It is an amenable number.

660520313 is a deficient number, since it is larger than the sum of its proper divisors (46577287).

660520313 is a wasteful number, since it uses less digits than its factorization.

660520313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492.

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

The square root of 660520313 is about 25700.5897403153. The cubic root of 660520313 is about 870.8875045128.

Adding to 660520313 its reverse (313025066), we get a palindrome (973545379).

The spelling of 660520313 in words is "six hundred sixty million, five hundred twenty thousand, three hundred thirteen".