6557469278909 has 2 divisors, whose sum is σ = 6557469278910. Its totient is φ = 6557469278908.

The previous prime is 6557469278897. The next prime is 6557469279043. The reversal of 6557469278909 is 9098729647556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4275321259225 + 2282148019684 = 2067685^2 + 1510678^2 .

It is a cyclic number.

It is not a de Polignac number, because 6557469278909 - 2²⁴ = 6557452501693 is a prime.

It is a super-3 number, since 3×6557469278909³ (a number of 39 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6557469278909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6557469275909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3278734639454 + 3278734639455.

It is an arithmetic number, because the mean of its divisors is an integer number (3278734639455).

Almost surely, 2^{6557469278909} is an apocalyptic number.

It is an amenable number.

6557469278909 is a deficient number, since it is larger than the sum of its proper divisors (1).

6557469278909 is an equidigital number, since it uses as much as digits as its factorization.

6557469278909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2057529600, while the sum is 77.

The spelling of 6557469278909 in words is "six trillion, five hundred fifty-seven billion, four hundred sixty-nine million, two hundred seventy-eight thousand, nine hundred nine".