2565978774679 has 2 divisors, whose sum is σ = 2565978774680. Its totient is φ = 2565978774678.

The previous prime is 2565978774661. The next prime is 2565978774787. The reversal of 2565978774679 is 9764778795652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2565978774679 - 2⁷ = 2565978774551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2565978774479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282989387339 + 1282989387340.

It is an arithmetic number, because the mean of its divisors is an integer number (1282989387340).

Almost surely, 2^{2565978774679} is an apocalyptic number.

2565978774679 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565978774679 is an equidigital number, since it uses as much as digits as its factorization.

2565978774679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11202105600, while the sum is 82.

The spelling of 2565978774679 in words is "two trillion, five hundred sixty-five billion, nine hundred seventy-eight million, seven hundred seventy-four thousand, six hundred seventy-nine".