2168207666 has 8 divisors (see below), whose sum is σ = 3321509760. Its totient is φ = 1061037748.

The previous prime is 2168207663. The next prime is 2168207669. The reversal of 2168207666 is 6667028612.

It is an interprime number because it is at equal distance from previous prime (2168207663) and next prime (2168207669).

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

It is a super-2 number, since 2×2168207666² = 9402248965802335112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2168207663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11532926 + ... + 11533113.

It is an arithmetic number, because the mean of its divisors is an integer number (415188720).

Almost surely, 2^2168207666 is an apocalyptic number.

2168207666 is a deficient number, since it is larger than the sum of its proper divisors (1153302094).

2168207666 is a wasteful number, since it uses less digits than its factorization.

2168207666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23066088.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 2168207666 is about 46564.0168585143. The cubic root of 2168207666 is about 1294.2960482888.

The spelling of 2168207666 in words is "two billion, one hundred sixty-eight million, two hundred seven thousand, six hundred sixty-six".