6556560181 has 2 divisors, whose sum is σ = 6556560182. Its totient is φ = 6556560180.

The previous prime is 6556560151. The next prime is 6556560191. The reversal of 6556560181 is 1810656556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6510876100 + 45684081 = 80690^2 + 6759^2 .

It is a cyclic number.

It is not a de Polignac number, because 6556560181 - 2²⁷ = 6422342453 is a prime.

It is a super-2 number, since 2×6556560181² = 85976962814149505522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6556560151) 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, 3278280090 + 3278280091.

It is an arithmetic number, because the mean of its divisors is an integer number (3278280091).

Almost surely, 2^6556560181 is an apocalyptic number.

It is an amenable number.

6556560181 is a deficient number, since it is larger than the sum of its proper divisors (1).

6556560181 is an equidigital number, since it uses as much as digits as its factorization.

6556560181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216000, while the sum is 43.

The square root of 6556560181 is about 80972.5890718581. The cubic root of 6556560181 is about 1871.6530685652.

The spelling of 6556560181 in words is "six billion, five hundred fifty-six million, five hundred sixty thousand, one hundred eighty-one".