15974139769717 has 2 divisors, whose sum is σ = 15974139769718. Its totient is φ = 15974139769716.

The previous prime is 15974139769667. The next prime is 15974139769759. The reversal of 15974139769717 is 71796793147951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8249998142961 + 7724141626756 = 2872281^2 + 2779234^2 .

It is a cyclic number.

It is not a de Polignac number, because 15974139769717 - 2³⁹ = 15424383955829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15974139760717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7987069884858 + 7987069884859.

It is an arithmetic number, because the mean of its divisors is an integer number (7987069884859).

Almost surely, 2^{15974139769717} is an apocalyptic number.

It is an amenable number.

15974139769717 is a deficient number, since it is larger than the sum of its proper divisors (1).

15974139769717 is an equidigital number, since it uses as much as digits as its factorization.

15974139769717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630118440, while the sum is 76.

The spelling of 15974139769717 in words is "fifteen trillion, nine hundred seventy-four billion, one hundred thirty-nine million, seven hundred sixty-nine thousand, seven hundred seventeen".