2118796866 has 80 divisors (see below), whose sum is σ = 4930295040. Its totient is φ = 679376160.

The previous prime is 2118796793. The next prime is 2118796871. The reversal of 2118796866 is 6686978112.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 897760 + ... + 900116.

It is an arithmetic number, because the mean of its divisors is an integer number (61628688).

Almost surely, 2^2118796866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2118796866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2465147520).

2118796866 is an abundant number, since it is smaller than the sum of its proper divisors (2811498174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2118796866 is a wasteful number, since it uses less digits than its factorization.

2118796866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581 (or 2572 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 2118796866 is about 46030.3906783334. The cubic root of 2118796866 is about 1284.3885953700.

The spelling of 2118796866 in words is "two billion, one hundred eighteen million, seven hundred ninety-six thousand, eight hundred sixty-six".