2556659494793 has 2 divisors, whose sum is σ = 2556659494794. Its totient is φ = 2556659494792.

The previous prime is 2556659494771. The next prime is 2556659494819. The reversal of 2556659494793 is 3974949566552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2546922344464 + 9737150329 = 1595908^2 + 98677^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556659494793 - 2³⁰ = 2555585752969 is a prime.

It is a super-2 number, since 2×2556659494793² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2556659494793.

It is not a weakly prime, because it can be changed into another prime (2556659490793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278329747396 + 1278329747397.

It is an arithmetic number, because the mean of its divisors is an integer number (1278329747397).

Almost surely, 2^{2556659494793} is an apocalyptic number.

It is an amenable number.

2556659494793 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556659494793 is an equidigital number, since it uses as much as digits as its factorization.

2556659494793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2204496000, while the sum is 74.

The spelling of 2556659494793 in words is "two trillion, five hundred fifty-six billion, six hundred fifty-nine million, four hundred ninety-four thousand, seven hundred ninety-three".