2118047778 has 96 divisors (see below), whose sum is σ = 5933491200. Its totient is φ = 550132560.

The previous prime is 2118047699. The next prime is 2118047791. The reversal of 2118047778 is 8777408112.

It is a super-4 number, since 4×2118047778⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9123 + ... + 65721.

It is an arithmetic number, because the mean of its divisors is an integer number (61807200).

Almost surely, 2^2118047778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2118047778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2966745600).

2118047778 is an abundant number, since it is smaller than the sum of its proper divisors (3815443422).

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

2118047778 is a wasteful number, since it uses less digits than its factorization.

2118047778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56634 (or 56622 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 45.

The square root of 2118047778 is about 46022.2530739207. The cubic root of 2118047778 is about 1284.2372148852.

The spelling of 2118047778 in words is "two billion, one hundred eighteen million, forty-seven thousand, seven hundred seventy-eight".