2556155647 has 2 divisors, whose sum is σ = 2556155648. Its totient is φ = 2556155646.

The previous prime is 2556155617. The next prime is 2556155681. The reversal of 2556155647 is 7465516552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2556155647 - 2²³ = 2547767039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2556155597 and 2556155606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2556155617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278077823 + 1278077824.

It is an arithmetic number, because the mean of its divisors is an integer number (1278077824).

Almost surely, 2^2556155647 is an apocalyptic number.

2556155647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556155647 is an equidigital number, since it uses as much as digits as its factorization.

2556155647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260000, while the sum is 46.

The square root of 2556155647 is about 50558.4379406643. The cubic root of 2556155647 is about 1367.2956485382.

It can be divided in two parts, 2556 and 155647, that added together give a triangular number (158203 = T₅₆₂).

The spelling of 2556155647 in words is "two billion, five hundred fifty-six million, one hundred fifty-five thousand, six hundred forty-seven".