2556659494819 has 2 divisors, whose sum is σ = 2556659494820. Its totient is φ = 2556659494818.

The previous prime is 2556659494793. The next prime is 2556659494877. The reversal of 2556659494819 is 9184949566552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2556659494819 - 2⁹ = 2556659494307 is a prime.

It is a super-2 number, since 2×2556659494819² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2556659494889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278329747409 + 1278329747410.

It is an arithmetic number, because the mean of its divisors is an integer number (1278329747410).

Almost surely, 2^{2556659494819} is an apocalyptic number.

2556659494819 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556659494819 is an equidigital number, since it uses as much as digits as its factorization.

2556659494819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808000, while the sum is 73.

The spelling of 2556659494819 in words is "two trillion, five hundred fifty-six billion, six hundred fifty-nine million, four hundred ninety-four thousand, eight hundred nineteen".