2566328681 has 8 divisors (see below), whose sum is σ = 2939571264. Its totient is φ = 2194742160.

The previous prime is 2566328669. The next prime is 2566328683. The reversal of 2566328681 is 1868236652.

2566328681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2566328681 - 2¹⁴ = 2566312297 is a prime.

It is a super-2 number, since 2×2566328681² = 13172085797846399522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2566328683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410690 + ... + 416891.

It is an arithmetic number, because the mean of its divisors is an integer number (367446408).

Almost surely, 2^2566328681 is an apocalyptic number.

It is an amenable number.

2566328681 is a deficient number, since it is larger than the sum of its proper divisors (373242583).

2566328681 is an equidigital number, since it uses as much as digits as its factorization.

2566328681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828031.

The product of its digits is 829440, while the sum is 47.

The square root of 2566328681 is about 50658.9447284485. The cubic root of 2566328681 is about 1369.1071101293.

The spelling of 2566328681 in words is "two billion, five hundred sixty-six million, three hundred twenty-eight thousand, six hundred eighty-one".