9999799764517 has 2 divisors, whose sum is σ = 9999799764518. Its totient is φ = 9999799764516.

The previous prime is 9999799764433. The next prime is 9999799764529. The reversal of 9999799764517 is 7154679979999.

It is a Cunningham number, because it is equal to 3162246²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9999799764516 + 1 = 3162246^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999799764517 - 2¹⁵ = 9999799731749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999799764547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999899882258 + 4999899882259.

It is an arithmetic number, because the mean of its divisors is an integer number (4999899882259).

Almost surely, 2^{9999799764517} is an apocalyptic number.

It is an amenable number.

9999799764517 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999799764517 is an equidigital number, since it uses as much as digits as its factorization.

9999799764517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21874111560, while the sum is 91.

The spelling of 9999799764517 in words is "nine trillion, nine hundred ninety-nine billion, seven hundred ninety-nine million, seven hundred sixty-four thousand, five hundred seventeen".