2567861681 has 16 divisors (see below), whose sum is σ = 3205893120. Its totient is φ = 1998179280.

The previous prime is 2567861671. The next prime is 2567861683. The reversal of 2567861681 is 1861687652.

2567861681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2567861681 - 2⁶ = 2567861617 is a prime.

It is a super-2 number, since 2×2567861681² = 13187827225496291522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2567861683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34340 + ... + 79466.

It is an arithmetic number, because the mean of its divisors is an integer number (200368320).

Almost surely, 2^2567861681 is an apocalyptic number.

It is an amenable number.

2567861681 is a deficient number, since it is larger than the sum of its proper divisors (638031439).

2567861681 is a wasteful number, since it uses less digits than its factorization.

2567861681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45884.

The product of its digits is 967680, while the sum is 50.

The square root of 2567861681 is about 50674.0730650300. The cubic root of 2567861681 is about 1369.3796685430.

The spelling of 2567861681 in words is "two billion, five hundred sixty-seven million, eight hundred sixty-one thousand, six hundred eighty-one".