2564557081 has 2 divisors, whose sum is σ = 2564557082. Its totient is φ = 2564557080.

The previous prime is 2564557033. The next prime is 2564557141. The reversal of 2564557081 is 1807554652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2110483600 + 454073481 = 45940^2 + 21309^2 .

It is a cyclic number.

It is not a de Polignac number, because 2564557081 - 2⁹ = 2564556569 is a prime.

It is a super-2 number, since 2×2564557081² = 13153906043414481122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2564557381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282278540 + 1282278541.

It is an arithmetic number, because the mean of its divisors is an integer number (1282278541).

Almost surely, 2^2564557081 is an apocalyptic number.

It is an amenable number.

2564557081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2564557081 is an equidigital number, since it uses as much as digits as its factorization.

2564557081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336000, while the sum is 43.

The square root of 2564557081 is about 50641.4561500753. The cubic root of 2564557081 is about 1368.7919948028.

The spelling of 2564557081 in words is "two billion, five hundred sixty-four million, five hundred fifty-seven thousand, eighty-one".