2576768681 has 4 divisors (see below), whose sum is σ = 2625387012. Its totient is φ = 2528150352.

The previous prime is 2576768651. The next prime is 2576768717. The reversal of 2576768681 is 1868676752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2062613056 + 514155625 = 45416^2 + 22675^2 .

It is a cyclic number.

It is not a de Polignac number, because 2576768681 - 2¹⁰ = 2576767657 is a prime.

It is a super-2 number, since 2×2576768681² = 13279473670764959522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2576768641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24309086 + ... + 24309191.

It is an arithmetic number, because the mean of its divisors is an integer number (656346753).

Almost surely, 2^2576768681 is an apocalyptic number.

It is an amenable number.

2576768681 is a deficient number, since it is larger than the sum of its proper divisors (48618331).

2576768681 is an equidigital number, since it uses as much as digits as its factorization.

2576768681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48618330.

The product of its digits is 6773760, while the sum is 56.

The square root of 2576768681 is about 50761.8821656565. The cubic root of 2576768681 is about 1370.9611386409.

The spelling of 2576768681 in words is "two billion, five hundred seventy-six million, seven hundred sixty-eight thousand, six hundred eighty-one".