2656515509 has 2 divisors, whose sum is σ = 2656515510. Its totient is φ = 2656515508.

The previous prime is 2656515493. The next prime is 2656515553. The reversal of 2656515509 is 9055156562.

It is an a-pointer prime, because the next prime (2656515553) can be obtained adding 2656515509 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1949487409 + 707028100 = 44153^2 + 26590^2 .

It is a cyclic number.

It is not a de Polignac number, because 2656515509 - 2⁴ = 2656515493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2656515509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2656515569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328257754 + 1328257755.

It is an arithmetic number, because the mean of its divisors is an integer number (1328257755).

Almost surely, 2^2656515509 is an apocalyptic number.

It is an amenable number.

2656515509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656515509 is an equidigital number, since it uses as much as digits as its factorization.

2656515509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 405000, while the sum is 44.

The square root of 2656515509 is about 51541.3960715074. The cubic root of 2656515509 is about 1384.9607063100.

The spelling of 2656515509 in words is "two billion, six hundred fifty-six million, five hundred fifteen thousand, five hundred nine".