9791116613857 has 2 divisors, whose sum is σ = 9791116613858. Its totient is φ = 9791116613856.

The previous prime is 9791116613749. The next prime is 9791116613879. The reversal of 9791116613857 is 7583166111979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9791116613776 + 81 = 3129076^2 + 9^2 .

It is a cyclic number.

It is not a de Polignac number, because 9791116613857 - 2¹⁵ = 9791116581089 is a prime.

It is a super-2 number, since 2×9791116613857² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9791116619857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4895558306928 + 4895558306929.

It is an arithmetic number, because the mean of its divisors is an integer number (4895558306929).

Almost surely, 2^{9791116613857} is an apocalyptic number.

It is an amenable number.

9791116613857 is a deficient number, since it is larger than the sum of its proper divisors (1).

9791116613857 is an equidigital number, since it uses as much as digits as its factorization.

9791116613857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17146080, while the sum is 64.

The spelling of 9791116613857 in words is "nine trillion, seven hundred ninety-one billion, one hundred sixteen million, six hundred thirteen thousand, eight hundred fifty-seven".