8117740661 has 2 divisors, whose sum is σ = 8117740662. Its totient is φ = 8117740660.

The previous prime is 8117740651. The next prime is 8117740663. The reversal of 8117740661 is 1660477118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6243370225 + 1874370436 = 79015^2 + 43294^2 .

It is a cyclic number.

It is not a de Polignac number, because 8117740661 - 2¹⁸ = 8117478517 is a prime.

Together with 8117740663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8117740663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4058870330 + 4058870331.

It is an arithmetic number, because the mean of its divisors is an integer number (4058870331).

Almost surely, 2^8117740661 is an apocalyptic number.

It is an amenable number.

8117740661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8117740661 is an equidigital number, since it uses as much as digits as its factorization.

8117740661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 8117740661 is about 90098.5053205657. The cubic root of 8117740661 is about 2009.7639765599.

The spelling of 8117740661 in words is "eight billion, one hundred seventeen million, seven hundred forty thousand, six hundred sixty-one".