2164656566 has 8 divisors (see below), whose sum is σ = 3247560864. Its totient is φ = 1082136280.

The previous prime is 2164656551. The next prime is 2164656577. The reversal of 2164656566 is 6656564612.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2164656566.

It is a congruent 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 in 3 ways as a sum of consecutive naturals, for example, 81470 + ... + 104721.

It is an arithmetic number, because the mean of its divisors is an integer number (405945108).

Almost surely, 2^2164656566 is an apocalyptic number.

2164656566 is a deficient number, since it is larger than the sum of its proper divisors (1082904298).

2164656566 is a wasteful number, since it uses less digits than its factorization.

2164656566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192006.

The product of its digits is 1555200, while the sum is 47.

The square root of 2164656566 is about 46525.8698575319. The cubic root of 2164656566 is about 1293.5890609360.

The spelling of 2164656566 in words is "two billion, one hundred sixty-four million, six hundred fifty-six thousand, five hundred sixty-six".