2556946369 has 2 divisors, whose sum is σ = 2556946370. Its totient is φ = 2556946368.

The previous prime is 2556946351. The next prime is 2556946391. The reversal of 2556946369 is 9636496552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1822265344 + 734681025 = 42688^2 + 27105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2556946369 is a prime.

It is a super-2 number, since 2×2556946369² = 13075949467884568322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2556946169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278473184 + 1278473185.

It is an arithmetic number, because the mean of its divisors is an integer number (1278473185).

Almost surely, 2^2556946369 is an apocalyptic number.

It is an amenable number.

2556946369 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556946369 is an equidigital number, since it uses as much as digits as its factorization.

2556946369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10497600, while the sum is 55.

The square root of 2556946369 is about 50566.2572176348. The cubic root of 2556946369 is about 1367.4366205599.

The spelling of 2556946369 in words is "two billion, five hundred fifty-six million, nine hundred forty-six thousand, three hundred sixty-nine".