3306816721 has 8 divisors (see below), whose sum is σ = 3561758144. Its totient is φ = 3051956880.

The previous prime is 3306816713. The next prime is 3306816763. The reversal of 3306816721 is 1276186033.

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

It is a cyclic number.

It is not a de Polignac number, because 3306816721 - 2³ = 3306816713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3306816701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83386 + ... + 116476.

It is an arithmetic number, because the mean of its divisors is an integer number (445219768).

Almost surely, 2^3306816721 is an apocalyptic number.

It is an amenable number.

3306816721 is a deficient number, since it is larger than the sum of its proper divisors (254941423).

3306816721 is a wasteful number, since it uses less digits than its factorization.

3306816721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40791.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 3306816721 is about 57504.9277975375. The cubic root of 3306816721 is about 1489.8299763954.

The spelling of 3306816721 in words is "three billion, three hundred six million, eight hundred sixteen thousand, seven hundred twenty-one".