6637618841 has 12 divisors (see below), whose sum is σ = 7727664420. Its totient is φ = 5684706720.

The previous prime is 6637618807. The next prime is 6637618849. The reversal of 6637618841 is 1488167366.

It can be written as a sum of positive squares in 2 ways, for example, as 4195282441 + 2442336400 = 64771^2 + 49420^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6637618841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6637618841.

It is not an unprimeable number, because it can be changed into a prime (6637618849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5111 + ... + 115331.

It is an arithmetic number, because the mean of its divisors is an integer number (643972035).

Almost surely, 2^6637618841 is an apocalyptic number.

It is an amenable number.

6637618841 is a deficient number, since it is larger than the sum of its proper divisors (1090045579).

6637618841 is a wasteful number, since it uses less digits than its factorization.

6637618841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111464 (or 111457 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 50.

The square root of 6637618841 is about 81471.5830274581. The cubic root of 6637618841 is about 1879.3345729536.

The spelling of 6637618841 in words is "six billion, six hundred thirty-seven million, six hundred eighteen thousand, eight hundred forty-one".