6556135081 has 2 divisors, whose sum is σ = 6556135082. Its totient is φ = 6556135080.

The previous prime is 6556135049. The next prime is 6556135093. The reversal of 6556135081 is 1805316556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5316743056 + 1239392025 = 72916^2 + 35205^2 .

It is a cyclic number.

It is not a de Polignac number, because 6556135081 - 2⁵ = 6556135049 is a prime.

It is a super-2 number, since 2×6556135081² = 85965814400637753122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6556135181) 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, 3278067540 + 3278067541.

It is an arithmetic number, because the mean of its divisors is an integer number (3278067541).

Almost surely, 2^6556135081 is an apocalyptic number.

It is an amenable number.

6556135081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6556135081 is an equidigital number, since it uses as much as digits as its factorization.

6556135081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 6556135081 is about 80969.9640669304. The cubic root of 6556135081 is about 1871.6126176329.

The spelling of 6556135081 in words is "six billion, five hundred fifty-six million, one hundred thirty-five thousand, eighty-one".