2668637818 has 48 divisors (see below), whose sum is σ = 5293229760. Its totient is φ = 984994560.

The previous prime is 2668637779. The next prime is 2668637831. The reversal of 2668637818 is 8187368662.

2668637818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2668637818² = 14243255607319602248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9271 + ... + 73642.

It is an arithmetic number, because the mean of its divisors is an integer number (110275620).

Almost surely, 2^2668637818 is an apocalyptic number.

2668637818 is a deficient number, since it is larger than the sum of its proper divisors (2624591942).

2668637818 is a wasteful number, since it uses less digits than its factorization.

2668637818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82963 (or 82952 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 55.

The square root of 2668637818 is about 51658.8600145222. The cubic root of 2668637818 is about 1387.0641445481.

The spelling of 2668637818 in words is "two billion, six hundred sixty-eight million, six hundred thirty-seven thousand, eight hundred eighteen".