2556433643 has 2 divisors, whose sum is σ = 2556433644. Its totient is φ = 2556433642.

The previous prime is 2556433639. The next prime is 2556433661. The reversal of 2556433643 is 3463346552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2556433643 - 2² = 2556433639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2556433643.

It is not a weakly prime, because it can be changed into another prime (2556433543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278216821 + 1278216822.

It is an arithmetic number, because the mean of its divisors is an integer number (1278216822).

Almost surely, 2^2556433643 is an apocalyptic number.

2556433643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556433643 is an equidigital number, since it uses as much as digits as its factorization.

2556433643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 41.

The square root of 2556433643 is about 50561.1871201616. The cubic root of 2556433643 is about 1367.3452137180.

The spelling of 2556433643 in words is "two billion, five hundred fifty-six million, four hundred thirty-three thousand, six hundred forty-three".