15640516232717 has 2 divisors, whose sum is σ = 15640516232718. Its totient is φ = 15640516232716.

The previous prime is 15640516232711. The next prime is 15640516232791. The reversal of 15640516232717 is 71723261504651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9305056075561 + 6335460157156 = 3050419^2 + 2517034^2 .

It is a cyclic number.

It is not a de Polignac number, because 15640516232717 - 2¹⁴ = 15640516216333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15640516232711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7820258116358 + 7820258116359.

It is an arithmetic number, because the mean of its divisors is an integer number (7820258116359).

Almost surely, 2^{15640516232717} is an apocalyptic number.

It is an amenable number.

15640516232717 is a deficient number, since it is larger than the sum of its proper divisors (1).

15640516232717 is an equidigital number, since it uses as much as digits as its factorization.

15640516232717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2116800, while the sum is 50.

The spelling of 15640516232717 in words is "fifteen trillion, six hundred forty billion, five hundred sixteen million, two hundred thirty-two thousand, seven hundred seventeen".