2678885718381 has 24 divisors (see below), whose sum is σ = 3978742087320. Its totient is φ = 1735618306176.

The previous prime is 2678885718359. The next prime is 2678885718413. The reversal of 2678885718381 is 1838175888762.

2678885718381 is a `hidden beast` number, since 26 + 7 + 88 + 85 + 71 + 8 + 381 = 666.

2678885718381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1020029301225 + 1658856417156 = 1009965^2 + 1287966^2 .

It is not a de Polignac number, because 2678885718381 - 2⁷ = 2678885718253 is a prime.

It is a super-2 number, since 2×2678885718381² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2678885718181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4431486 + ... + 4999583.

It is an arithmetic number, because the mean of its divisors is an integer number (165780920305).

Almost surely, 2^{2678885718381} is an apocalyptic number.

It is an amenable number.

2678885718381 is a deficient number, since it is larger than the sum of its proper divisors (1299856368939).

2678885718381 is a wasteful number, since it uses less digits than its factorization.

2678885718381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9431965 (or 9431962 counting only the distinct ones).

The product of its digits is 289013760, while the sum is 72.

The spelling of 2678885718381 in words is "two trillion, six hundred seventy-eight billion, eight hundred eighty-five million, seven hundred eighteen thousand, three hundred eighty-one".