9999660321793 has 2 divisors, whose sum is σ = 9999660321794. Its totient is φ = 9999660321792.

The previous prime is 9999660321743. The next prime is 9999660321809. The reversal of 9999660321793 is 3971230669999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7630671442689 + 2368988879104 = 2762367^2 + 1539152^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999660321793 - 2³³ = 9991070387201 is a prime.

It is not a weakly prime, because it can be changed into another prime (9999660321733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999830160896 + 4999830160897.

It is an arithmetic number, because the mean of its divisors is an integer number (4999830160897).

Almost surely, 2^{9999660321793} is an apocalyptic number.

It is an amenable number.

9999660321793 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999660321793 is an equidigital number, since it uses as much as digits as its factorization.

9999660321793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 267846264, while the sum is 73.

The spelling of 9999660321793 in words is "nine trillion, nine hundred ninety-nine billion, six hundred sixty million, three hundred twenty-one thousand, seven hundred ninety-three".