6555555509 has 2 divisors, whose sum is σ = 6555555510. Its totient is φ = 6555555508.

The previous prime is 6555555467. The next prime is 6555555547. The reversal of 6555555509 is 9055555556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6480733009 + 74822500 = 80503^2 + 8650^2 .

It is a cyclic number.

It is not a de Polignac number, because 6555555509 - 2²⁸ = 6287120053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6555555569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3277777754 + 3277777755.

It is an arithmetic number, because the mean of its divisors is an integer number (3277777755).

Almost surely, 2^6555555509 is an apocalyptic number.

It is an amenable number.

6555555509 is a deficient number, since it is larger than the sum of its proper divisors (1).

6555555509 is an equidigital number, since it uses as much as digits as its factorization.

6555555509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4218750, while the sum is 50.

The square root of 6555555509 is about 80966.3850557748. The cubic root of 6555555509 is about 1871.5574649034.

The spelling of 6555555509 in words is "six billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred nine".