16668805 has 4 divisors (see below), whose sum is σ = 20002572. Its totient is φ = 13335040.

The previous prime is 16668803. The next prime is 16668809. The reversal of 16668805 is 50886661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12916836 + 3751969 = 3594^2 + 1937^2 .

It is not a de Polignac number, because 16668805 - 2¹ = 16668803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16668803) 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, 1666876 + ... + 1666885.

It is an arithmetic number, because the mean of its divisors is an integer number (5000643).

Almost surely, 2^16668805 is an apocalyptic number.

It is an amenable number.

16668805 is a deficient number, since it is larger than the sum of its proper divisors (3333767).

16668805 is an equidigital number, since it uses as much as digits as its factorization.

16668805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333766.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 16668805 is about 4082.7447875173. The cubic root of 16668805 is about 255.4474011640.

The spelling of 16668805 in words is "sixteen million, six hundred sixty-eight thousand, eight hundred five".