2566131881 has 2 divisors, whose sum is σ = 2566131882. Its totient is φ = 2566131880.

The previous prime is 2566131859. The next prime is 2566131889. The reversal of 2566131881 is 1881316652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2277675625 + 288456256 = 47725^2 + 16984^2 .

It is a cyclic number.

It is not a de Polignac number, because 2566131881 - 2⁶ = 2566131817 is a prime.

It is a super-2 number, since 2×2566131881² = 13170065661369196322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2566131889) 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, 1283065940 + 1283065941.

It is an arithmetic number, because the mean of its divisors is an integer number (1283065941).

Almost surely, 2^2566131881 is an apocalyptic number.

It is an amenable number.

2566131881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2566131881 is an equidigital number, since it uses as much as digits as its factorization.

2566131881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 2566131881 is about 50657.0022899105. The cubic root of 2566131881 is about 1369.0721123821.

The spelling of 2566131881 in words is "two billion, five hundred sixty-six million, one hundred thirty-one thousand, eight hundred eighty-one".