2668779861 has 32 divisors (see below), whose sum is σ = 4127127552. Its totient is φ = 1517904960.

The previous prime is 2668779851. The next prime is 2668779931. The reversal of 2668779861 is 1689778662.

2668779861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2668779861 - 2⁷ = 2668779733 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2668779795 and 2668779804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2668779851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7056 + ... + 73398.

It is an arithmetic number, because the mean of its divisors is an integer number (128972736).

Almost surely, 2^2668779861 is an apocalyptic number.

It is an amenable number.

2668779861 is a deficient number, since it is larger than the sum of its proper divisors (1458347691).

2668779861 is a wasteful number, since it uses less digits than its factorization.

2668779861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66433.

The product of its digits is 12192768, while the sum is 60.

The square root of 2668779861 is about 51660.2348136359. The cubic root of 2668779861 is about 1387.0887537645.

The spelling of 2668779861 in words is "two billion, six hundred sixty-eight million, seven hundred seventy-nine thousand, eight hundred sixty-one".