2166778714 has 4 divisors (see below), whose sum is σ = 3250168074. Its totient is φ = 1083389356.

The previous prime is 2166778699. The next prime is 2166778721. The reversal of 2166778714 is 4178776612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2129361025 + 37417689 = 46145^2 + 6117^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541694677 + ... + 541694680.

Almost surely, 2^2166778714 is an apocalyptic number.

2166778714 is a deficient number, since it is larger than the sum of its proper divisors (1083389360).

2166778714 is a wasteful number, since it uses less digits than its factorization.

2166778714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083389359.

The product of its digits is 790272, while the sum is 49.

The square root of 2166778714 is about 46548.6703784329. The cubic root of 2166778714 is about 1294.0116515796.

The spelling of 2166778714 in words is "two billion, one hundred sixty-six million, seven hundred seventy-eight thousand, seven hundred fourteen".