8668390777 has 2 divisors, whose sum is σ = 8668390778. Its totient is φ = 8668390776.

The previous prime is 8668390739. The next prime is 8668390807. The reversal of 8668390777 is 7770938668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8664631056 + 3759721 = 93084^2 + 1939^2 .

It is a cyclic number.

It is not a de Polignac number, because 8668390777 - 2¹⁹ = 8667866489 is a prime.

It is not a weakly prime, because it can be changed into another prime (8668390727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4334195388 + 4334195389.

It is an arithmetic number, because the mean of its divisors is an integer number (4334195389).

Almost surely, 2^8668390777 is an apocalyptic number.

It is an amenable number.

8668390777 is a deficient number, since it is larger than the sum of its proper divisors (1).

8668390777 is an equidigital number, since it uses as much as digits as its factorization.

8668390777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21337344, while the sum is 61.

The square root of 8668390777 is about 93104.1931225442. The cubic root of 8668390777 is about 2054.2162502429.

The spelling of 8668390777 in words is "eight billion, six hundred sixty-eight million, three hundred ninety thousand, seven hundred seventy-seven".