2686127681 has 4 divisors (see below), whose sum is σ = 2687977812. Its totient is φ = 2684277552.

The previous prime is 2686127677. The next prime is 2686127701. The reversal of 2686127681 is 1867216862.

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 1738473025 + 947654656 = 41695^2 + 30784^2 .

It is a cyclic number.

It is not a de Polignac number, because 2686127681 - 2² = 2686127677 is a prime.

It is a super-2 number, since 2×2686127681² = 14430563837268875522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2686127281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 922886 + ... + 925791.

It is an arithmetic number, because the mean of its divisors is an integer number (671994453).

Almost surely, 2^2686127681 is an apocalyptic number.

It is an amenable number.

2686127681 is a deficient number, since it is larger than the sum of its proper divisors (1850131).

2686127681 is a wasteful number, since it uses less digits than its factorization.

2686127681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850130.

The product of its digits is 387072, while the sum is 47.

The square root of 2686127681 is about 51827.8658734855. The cubic root of 2686127681 is about 1390.0877540650.

The spelling of 2686127681 in words is "two billion, six hundred eighty-six million, one hundred twenty-seven thousand, six hundred eighty-one".