2566617481 has 2 divisors, whose sum is σ = 2566617482. Its totient is φ = 2566617480.

The previous prime is 2566617457. The next prime is 2566617509. The reversal of 2566617481 is 1847166652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2322758025 + 243859456 = 48195^2 + 15616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2566617481 is a prime.

It is a super-2 number, since 2×2566617481² = 13175050587549570722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2566617401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1283308740 + 1283308741.

It is an arithmetic number, because the mean of its divisors is an integer number (1283308741).

Almost surely, 2^2566617481 is an apocalyptic number.

It is an amenable number.

2566617481 is a deficient number, since it is larger than the sum of its proper divisors (1).

2566617481 is an equidigital number, since it uses as much as digits as its factorization.

2566617481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 46.

The square root of 2566617481 is about 50661.7950826853. The cubic root of 2566617481 is about 1369.1584653727.

The spelling of 2566617481 in words is "two billion, five hundred sixty-six million, six hundred seventeen thousand, four hundred eighty-one".