2556906787 has 2 divisors, whose sum is σ = 2556906788. Its totient is φ = 2556906786.

The previous prime is 2556906767. The next prime is 2556906823. The reversal of 2556906787 is 7876096552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2556906787 - 2¹¹ = 2556904739 is a prime.

It is not a weakly prime, because it can be changed into another prime (2556906767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278453393 + 1278453394.

It is an arithmetic number, because the mean of its divisors is an integer number (1278453394).

Almost surely, 2^2556906787 is an apocalyptic number.

2556906787 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556906787 is an equidigital number, since it uses as much as digits as its factorization.

2556906787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6350400, while the sum is 55.

The square root of 2556906787 is about 50565.8658286398. The cubic root of 2556906787 is about 1367.4295644667.

The spelling of 2556906787 in words is "two billion, five hundred fifty-six million, nine hundred six thousand, seven hundred eighty-seven".