15664960732517 has 2 divisors, whose sum is σ = 15664960732518. Its totient is φ = 15664960732516.

The previous prime is 15664960732501. The next prime is 15664960732571. The reversal of 15664960732517 is 71523706946651.

It is a happy number.

Together with next prime (15664960732571) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15168173993956 + 496786738561 = 3894634^2 + 704831^2 .

It is a cyclic number.

It is not a de Polignac number, because 15664960732517 - 2⁴ = 15664960732501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15664960732517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15664960732217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7832480366258 + 7832480366259.

It is an arithmetic number, because the mean of its divisors is an integer number (7832480366259).

Almost surely, 2^{15664960732517} is an apocalyptic number.

It is an amenable number.

15664960732517 is a deficient number, since it is larger than the sum of its proper divisors (1).

15664960732517 is an equidigital number, since it uses as much as digits as its factorization.

15664960732517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57153600, while the sum is 62.

The spelling of 15664960732517 in words is "fifteen trillion, six hundred sixty-four billion, nine hundred sixty million, seven hundred thirty-two thousand, five hundred seventeen".