2556273691 has 2 divisors, whose sum is σ = 2556273692. Its totient is φ = 2556273690.

The previous prime is 2556273677. The next prime is 2556273721. The reversal of 2556273691 is 1963726552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2556273691 - 2¹⁵ = 2556240923 is a prime.

It is not a weakly prime, because it can be changed into another prime (2556273641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278136845 + 1278136846.

It is an arithmetic number, because the mean of its divisors is an integer number (1278136846).

Almost surely, 2^2556273691 is an apocalyptic number.

2556273691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556273691 is an equidigital number, since it uses as much as digits as its factorization.

2556273691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 46.

The square root of 2556273691 is about 50559.6053287602. The cubic root of 2556273691 is about 1367.3166955825.

The spelling of 2556273691 in words is "two billion, five hundred fifty-six million, two hundred seventy-three thousand, six hundred ninety-one".