2056616581 has 2 divisors, whose sum is σ = 2056616582. Its totient is φ = 2056616580.

The previous prime is 2056616557. The next prime is 2056616593. The reversal of 2056616581 is 1856166502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2047562500 + 9054081 = 45250^2 + 3009^2 .

It is a cyclic number.

It is not a de Polignac number, because 2056616581 - 2⁷ = 2056616453 is a prime.

It is a super-2 number, since 2×2056616581² = 8459343522488259122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2056616501) 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, 1028308290 + 1028308291.

It is an arithmetic number, because the mean of its divisors is an integer number (1028308291).

Almost surely, 2^2056616581 is an apocalyptic number.

It is an amenable number.

2056616581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2056616581 is an equidigital number, since it uses as much as digits as its factorization.

2056616581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 2056616581 is about 45349.9347408571. The cubic root of 2056616581 is about 1271.6993353176.

The spelling of 2056616581 in words is "two billion, fifty-six million, six hundred sixteen thousand, five hundred eighty-one".