333666721 has 16 divisors (see below), whose sum is σ = 351781200. Its totient is φ = 316044288.

The previous prime is 333666689. The next prime is 333666737. The reversal of 333666721 is 127666333.

It can be written as a sum of positive squares in 8 ways, for example, as 32262400 + 301404321 = 5680^2 + 17361^2 .

It is a cyclic number.

It is not a de Polignac number, because 333666721 - 2⁵ = 333666689 is a prime.

It is a super-2 number, since 2×333666721² = 222666961405783682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (333666761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 586125 + ... + 586693.

It is an arithmetic number, because the mean of its divisors is an integer number (21986325).

Almost surely, 2^333666721 is an apocalyptic number.

It is an amenable number.

333666721 is a deficient number, since it is larger than the sum of its proper divisors (18114479).

333666721 is a wasteful number, since it uses less digits than its factorization.

333666721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948.

The product of its digits is 81648, while the sum is 37.

The square root of 333666721 is about 18266.5464989965. The cubic root of 333666721 is about 693.5923554256.

The spelling of 333666721 in words is "three hundred thirty-three million, six hundred sixty-six thousand, seven hundred twenty-one".