660616513 has 2 divisors, whose sum is σ = 660616514. Its totient is φ = 660616512.

The previous prime is 660616499. The next prime is 660616553. The reversal of 660616513 is 315616066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 473802289 + 186814224 = 21767^2 + 13668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660616513 is a prime.

It is not a weakly prime, because it can be changed into another prime (660616553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330308256 + 330308257.

It is an arithmetic number, because the mean of its divisors is an integer number (330308257).

Almost surely, 2^660616513 is an apocalyptic number.

It is an amenable number.

660616513 is a deficient number, since it is larger than the sum of its proper divisors (1).

660616513 is an equidigital number, since it uses as much as digits as its factorization.

660616513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 660616513 is about 25702.4612245598. The cubic root of 660616513 is about 870.9297819464.

The spelling of 660616513 in words is "six hundred sixty million, six hundred sixteen thousand, five hundred thirteen".