2136666866 has 8 divisors (see below), whose sum is σ = 3283171164. Its totient is φ = 1042276480.

The previous prime is 2136666863. The next prime is 2136666871. The reversal of 2136666866 is 6686666312.

It can be written as a sum of positive squares in 2 ways, for example, as 2032116241 + 104550625 = 45079^2 + 10225^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2136666863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13028375 + ... + 13028538.

Almost surely, 2^2136666866 is an apocalyptic number.

2136666866 is a deficient number, since it is larger than the sum of its proper divisors (1146504298).

2136666866 is a wasteful number, since it uses less digits than its factorization.

2136666866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26056956.

The product of its digits is 2239488, while the sum is 50.

The square root of 2136666866 is about 46224.0939986929. The cubic root of 2136666866 is about 1287.9893493615.

The spelling of 2136666866 in words is "two billion, one hundred thirty-six million, six hundred sixty-six thousand, eight hundred sixty-six".