660331513 has 2 divisors, whose sum is σ = 660331514. Its totient is φ = 660331512.

The previous prime is 660331487. The next prime is 660331523. The reversal of 660331513 is 315133066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376476409 + 283855104 = 19403^2 + 16848^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660331513 is a prime.

It is not a weakly prime, because it can be changed into another prime (660331523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330165756 + 330165757.

It is an arithmetic number, because the mean of its divisors is an integer number (330165757).

Almost surely, 2^660331513 is an apocalyptic number.

It is an amenable number.

660331513 is a deficient number, since it is larger than the sum of its proper divisors (1).

660331513 is an equidigital number, since it uses as much as digits as its factorization.

660331513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 660331513 is about 25696.9164103400. The cubic root of 660331513 is about 870.8045198182.

Adding to 660331513 its reverse (315133066), we get a palindrome (975464579).

The spelling of 660331513 in words is "six hundred sixty million, three hundred thirty-one thousand, five hundred thirteen".