6566889281 has 2 divisors, whose sum is σ = 6566889282. Its totient is φ = 6566889280.

The previous prime is 6566889257. The next prime is 6566889341. The reversal of 6566889281 is 1829886656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4062787600 + 2504101681 = 63740^2 + 50041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6566889281 is a prime.

It is a super-2 number, since 2×6566889281² = 86248069657825393922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6566889281.

It is not a weakly prime, because it can be changed into another prime (6566889221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3283444640 + 3283444641.

It is an arithmetic number, because the mean of its divisors is an integer number (3283444641).

Almost surely, 2^6566889281 is an apocalyptic number.

It is an amenable number.

6566889281 is a deficient number, since it is larger than the sum of its proper divisors (1).

6566889281 is an equidigital number, since it uses as much as digits as its factorization.

6566889281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9953280, while the sum is 59.

The square root of 6566889281 is about 81036.3454321578. The cubic root of 6566889281 is about 1872.6354103226.

The spelling of 6566889281 in words is "six billion, five hundred sixty-six million, eight hundred eighty-nine thousand, two hundred eighty-one".