2768561575681 has 4 divisors (see below), whose sum is σ = 3020248991664. Its totient is φ = 2516874159700.

The previous prime is 2768561575667. The next prime is 2768561575687. The reversal of 2768561575681 is 1865751658672.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2768561575681 - 2¹³ = 2768561567489 is a prime.

It is a super-2 number, since 2×2768561575681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2768561575687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125843707975 + ... + 125843707996.

It is an arithmetic number, because the mean of its divisors is an integer number (755062247916).

Almost surely, 2^{2768561575681} is an apocalyptic number.

It is an amenable number.

2768561575681 is a deficient number, since it is larger than the sum of its proper divisors (251687415983).

2768561575681 is a wasteful number, since it uses less digits than its factorization.

2768561575681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251687415982.

The product of its digits is 169344000, while the sum is 67.

The spelling of 2768561575681 in words is "two trillion, seven hundred sixty-eight billion, five hundred sixty-one million, five hundred seventy-five thousand, six hundred eighty-one".