2166778713 has 16 divisors (see below), whose sum is σ = 3152514816. Its totient is φ = 1312850640.

The previous prime is 2166778699. The next prime is 2166778721. The reversal of 2166778713 is 3178776612.

It is not a de Polignac number, because 2166778713 - 2²⁶ = 2099669849 is a prime.

It is a super-2 number, since 2×2166778713² = 9389859982219872738, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2166778513) 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, 175770 + ... + 187692.

It is an arithmetic number, because the mean of its divisors is an integer number (197032176).

Almost surely, 2^2166778713 is an apocalyptic number.

It is an amenable number.

2166778713 is a deficient number, since it is larger than the sum of its proper divisors (985736103).

2166778713 is a wasteful number, since it uses less digits than its factorization.

2166778713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17444.

The product of its digits is 592704, while the sum is 48.

The square root of 2166778713 is about 46548.6703676915. The cubic root of 2166778713 is about 1294.0116513805.

The spelling of 2166778713 in words is "two billion, one hundred sixty-six million, seven hundred seventy-eight thousand, seven hundred thirteen".