2666321 has 8 divisors (see below), whose sum is σ = 3179904. Its totient is φ = 2185920.

The previous prime is 2666309. The next prime is 2666381. The reversal of 2666321 is 1236662.

2666321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-2666321 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2666381) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8120 + ... + 8441.

It is an arithmetic number, because the mean of its divisors is an integer number (397488).

2^2666321 is an apocalyptic number.

It is an amenable number.

2666321 is a deficient number, since it is larger than the sum of its proper divisors (513583).

2666321 is a wasteful number, since it uses less digits than its factorization.

2666321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16591.

The product of its digits is 2592, while the sum is 26.

The square root of 2666321 is about 1632.8873200561. The cubic root of 2666321 is about 138.6662628142. Note that the first 3 decimals are identical.

The spelling of 2666321 in words is "two million, six hundred sixty-six thousand, three hundred twenty-one".