2556599797 has 2 divisors, whose sum is σ = 2556599798. Its totient is φ = 2556599796.

The previous prime is 2556599761. The next prime is 2556599807. The reversal of 2556599797 is 7979956552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2196890641 + 359709156 = 46871^2 + 18966^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556599797 - 2²⁷ = 2422382069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2556599497) 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, 1278299898 + 1278299899.

It is an arithmetic number, because the mean of its divisors is an integer number (1278299899).

Almost surely, 2^2556599797 is an apocalyptic number.

It is an amenable number.

2556599797 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556599797 is an equidigital number, since it uses as much as digits as its factorization.

2556599797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53581500, while the sum is 64.

The square root of 2556599797 is about 50562.8301917525. The cubic root of 2556599797 is about 1367.3748363599.

The spelling of 2556599797 in words is "two billion, five hundred fifty-six million, five hundred ninety-nine thousand, seven hundred ninety-seven".