2656872509 has 2 divisors, whose sum is σ = 2656872510. Its totient is φ = 2656872508.

The previous prime is 2656872479. The next prime is 2656872521. The reversal of 2656872509 is 9052786562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2079816025 + 577056484 = 45605^2 + 24022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2656872509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2656872539) 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, 1328436254 + 1328436255.

It is an arithmetic number, because the mean of its divisors is an integer number (1328436255).

Almost surely, 2^2656872509 is an apocalyptic number.

It is an amenable number.

2656872509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656872509 is an equidigital number, since it uses as much as digits as its factorization.

2656872509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The square root of 2656872509 is about 51544.8591908058. The cubic root of 2656872509 is about 1385.0227435695.

The spelling of 2656872509 in words is "two billion, six hundred fifty-six million, eight hundred seventy-two thousand, five hundred nine".