2178814881 has 16 divisors (see below), whose sum is σ = 3001075200. Its totient is φ = 1404620160.

The previous prime is 2178814871. The next prime is 2178814889. The reversal of 2178814881 is 1884188712.

It is not a de Polignac number, because 2178814881 - 2⁷ = 2178814753 is a prime.

It is a super-2 number, since 2×2178814881² = 9494468571334088322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2178814881.

It is not an unprimeable number, because it can be changed into a prime (2178814889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125095 + ... + 141443.

It is an arithmetic number, because the mean of its divisors is an integer number (187567200).

Almost surely, 2^2178814881 is an apocalyptic number.

It is an amenable number.

2178814881 is a deficient number, since it is larger than the sum of its proper divisors (822260319).

2178814881 is a wasteful number, since it uses less digits than its factorization.

2178814881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17816.

The product of its digits is 229376, while the sum is 48.

The square root of 2178814881 is about 46677.7771642995. Note that the first 3 decimals coincide. The cubic root of 2178814881 is about 1296.4032494543.

The spelling of 2178814881 in words is "two billion, one hundred seventy-eight million, eight hundred fourteen thousand, eight hundred eighty-one".