2668778407 has 2 divisors, whose sum is σ = 2668778408. Its totient is φ = 2668778406.

The previous prime is 2668778401. The next prime is 2668778417. The reversal of 2668778407 is 7048778662.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2668778407 - 2⁷ = 2668778279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2668778401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1334389203 + 1334389204.

It is an arithmetic number, because the mean of its divisors is an integer number (1334389204).

Almost surely, 2^2668778407 is an apocalyptic number.

2668778407 is a deficient number, since it is larger than the sum of its proper divisors (1).

2668778407 is an equidigital number, since it uses as much as digits as its factorization.

2668778407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6322176, while the sum is 55.

The square root of 2668778407 is about 51660.2207409144. The cubic root of 2668778407 is about 1387.0885018607.

The spelling of 2668778407 in words is "two billion, six hundred sixty-eight million, seven hundred seventy-eight thousand, four hundred seven".