9791066657 has 2 divisors, whose sum is σ = 9791066658. Its totient is φ = 9791066656.

The previous prime is 9791066599. The next prime is 9791066669. The reversal of 9791066657 is 7566601979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7640333281 + 2150733376 = 87409^2 + 46376^2 .

It is an emirp because it is prime and its reverse (7566601979) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9791066657 - 2¹⁴ = 9791050273 is a prime.

It is not a weakly prime, because it can be changed into another prime (9791066057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4895533328 + 4895533329.

It is an arithmetic number, because the mean of its divisors is an integer number (4895533329).

Almost surely, 2^9791066657 is an apocalyptic number.

It is an amenable number.

9791066657 is a deficient number, since it is larger than the sum of its proper divisors (1).

9791066657 is an equidigital number, since it uses as much as digits as its factorization.

9791066657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4286520, while the sum is 56.

The square root of 9791066657 is about 98949.8188831086. The cubic root of 9791066657 is about 2139.3245209219.

The spelling of 9791066657 in words is "nine billion, seven hundred ninety-one million, sixty-six thousand, six hundred fifty-seven".