2178966823 has 32 divisors (see below), whose sum is σ = 2612424960. Its totient is φ = 1794024960.

The previous prime is 2178966799. The next prime is 2178966869. The reversal of 2178966823 is 3286698712.

It is not a de Polignac number, because 2178966823 - 2⁵ = 2178966791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178966523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2401936 + ... + 2402842.

It is an arithmetic number, because the mean of its divisors is an integer number (81638280).

Almost surely, 2^2178966823 is an apocalyptic number.

2178966823 is a deficient number, since it is larger than the sum of its proper divisors (433458137).

2178966823 is a wasteful number, since it uses less digits than its factorization.

2178966823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407.

The product of its digits is 1741824, while the sum is 52.

The square root of 2178966823 is about 46679.4046984320. The cubic root of 2178966823 is about 1296.4333841123.

The spelling of 2178966823 in words is "two billion, one hundred seventy-eight million, nine hundred sixty-six thousand, eight hundred twenty-three".