2164676666 has 4 divisors (see below), whose sum is σ = 3247015002. Its totient is φ = 1082338332.

The previous prime is 2164676659. The next prime is 2164676681. The reversal of 2164676666 is 6666764612.

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., 2146005625 + 18671041 = 46325^2 + 4321^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541169165 + ... + 541169168.

Almost surely, 2^2164676666 is an apocalyptic number.

2164676666 is a deficient number, since it is larger than the sum of its proper divisors (1082338336).

2164676666 is a wasteful number, since it uses less digits than its factorization.

2164676666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082338335.

The product of its digits is 2612736, while the sum is 50.

The square root of 2164676666 is about 46526.0858658882. The cubic root of 2164676666 is about 1293.5930648136.

The spelling of 2164676666 in words is "two billion, one hundred sixty-four million, six hundred seventy-six thousand, six hundred sixty-six".