6555564257 has 6 divisors (see below), whose sum is σ = 7205702994. Its totient is φ = 5959603760.

The previous prime is 6555564241. The next prime is 6555564263. The reversal of 6555564257 is 7524655556.

It can be written as a sum of positive squares in only one way, i.e., 6239578081 + 315986176 = 78991^2 + 17776^2 .

It is not a de Polignac number, because 6555564257 - 2⁴ = 6555564241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6555567257) 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 in 5 ways as a sum of consecutive naturals, for example, 27088988 + ... + 27089229.

It is an arithmetic number, because the mean of its divisors is an integer number (1200950499).

Almost surely, 2^6555564257 is an apocalyptic number.

It is an amenable number.

6555564257 is a deficient number, since it is larger than the sum of its proper divisors (650138737).

6555564257 is a wasteful number, since it uses less digits than its factorization.

6555564257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54178239 (or 54178228 counting only the distinct ones).

The product of its digits is 6300000, while the sum is 50.

The square root of 6555564257 is about 80966.4390781761. The cubic root of 6555564257 is about 1871.5582973972.

The spelling of 6555564257 in words is "six billion, five hundred fifty-five million, five hundred sixty-four thousand, two hundred fifty-seven".