2611256881 has 2 divisors, whose sum is σ = 2611256882. Its totient is φ = 2611256880.

The previous prime is 2611256807. The next prime is 2611256891. The reversal of 2611256881 is 1886521162.

It is a happy number.

2611256881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1849000000 + 762256881 = 43000^2 + 27609^2 .

It is a cyclic number.

It is not a de Polignac number, because 2611256881 - 2²⁷ = 2477039153 is a prime.

It is a super-2 number, since 2×2611256881² = 13637324997139696322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2611256801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1305628440 + 1305628441.

It is an arithmetic number, because the mean of its divisors is an integer number (1305628441).

Almost surely, 2^2611256881 is an apocalyptic number.

It is an amenable number.

2611256881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2611256881 is an equidigital number, since it uses as much as digits as its factorization.

2611256881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 40.

The square root of 2611256881 is about 51100.4587161407. The cubic root of 2611256881 is about 1377.0504954158.

The spelling of 2611256881 in words is "two billion, six hundred eleven million, two hundred fifty-six thousand, eight hundred eighty-one".