2686781981867 has 16 divisors (see below), whose sum is σ = 2846396430240. Its totient is φ = 2528990201088.

The previous prime is 2686781981831. The next prime is 2686781981879. The reversal of 2686781981867 is 7681891876862.

It is a cyclic number.

It is not a de Polignac number, because 2686781981867 - 2¹⁰ = 2686781980843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2686781987867) 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, 79858973 + ... + 79892609.

It is an arithmetic number, because the mean of its divisors is an integer number (177899776890).

Almost surely, 2^{2686781981867} is an apocalyptic number.

2686781981867 is a deficient number, since it is larger than the sum of its proper divisors (159614448373).

2686781981867 is a wasteful number, since it uses less digits than its factorization.

2686781981867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60590.

The product of its digits is 780337152, while the sum is 77.

The spelling of 2686781981867 in words is "two trillion, six hundred eighty-six billion, seven hundred eighty-one million, nine hundred eighty-one thousand, eight hundred sixty-seven".