3336660721 has 2 divisors, whose sum is σ = 3336660722. Its totient is φ = 3336660720.

The previous prime is 3336660709. The next prime is 3336660731. The reversal of 3336660721 is 1270666333.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3326982400 + 9678321 = 57680^2 + 3111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3336660721 is a prime.

It is a super-2 number, since 2×3336660721² = 22266609534128479682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3336660731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1668330360 + 1668330361.

It is an arithmetic number, because the mean of its divisors is an integer number (1668330361).

Almost surely, 2^3336660721 is an apocalyptic number.

It is an amenable number.

3336660721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3336660721 is an equidigital number, since it uses as much as digits as its factorization.

3336660721 is an odious number, because the sum of its binary digits is odd.

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

The square root of 3336660721 is about 57763.8357538694. The cubic root of 3336660721 is about 1494.2984625871.

The spelling of 3336660721 in words is "three billion, three hundred thirty-six million, six hundred sixty thousand, seven hundred twenty-one".