6568997377 has 2 divisors, whose sum is σ = 6568997378. Its totient is φ = 6568997376.

The previous prime is 6568997339. The next prime is 6568997389. The reversal of 6568997377 is 7737998656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5434048656 + 1134948721 = 73716^2 + 33689^2 .

It is a cyclic number.

It is not a de Polignac number, because 6568997377 - 2²⁷ = 6434779649 is a prime.

It is not a weakly prime, because it can be changed into another prime (6568997077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3284498688 + 3284498689.

It is an arithmetic number, because the mean of its divisors is an integer number (3284498689).

Almost surely, 2^6568997377 is an apocalyptic number.

It is an amenable number.

6568997377 is a deficient number, since it is larger than the sum of its proper divisors (1).

6568997377 is an equidigital number, since it uses as much as digits as its factorization.

6568997377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120022560, while the sum is 67.

The square root of 6568997377 is about 81049.3514903111. The cubic root of 6568997377 is about 1872.8357727112.

The spelling of 6568997377 in words is "six billion, five hundred sixty-eight million, nine hundred ninety-seven thousand, three hundred seventy-seven".