3313501728721 has 2 divisors, whose sum is σ = 3313501728722. Its totient is φ = 3313501728720.

The previous prime is 3313501728683. The next prime is 3313501728763. The reversal of 3313501728721 is 1278271053133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3177145827025 + 136355901696 = 1782455^2 + 369264^2 .

It is a cyclic number.

It is not a de Polignac number, because 3313501728721 - 2¹¹ = 3313501726673 is a prime.

It is not a weakly prime, because it can be changed into another prime (3313501728221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1656750864360 + 1656750864361.

It is an arithmetic number, because the mean of its divisors is an integer number (1656750864361).

Almost surely, 2^{3313501728721} is an apocalyptic number.

It is an amenable number.

3313501728721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3313501728721 is an equidigital number, since it uses as much as digits as its factorization.

3313501728721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 3313501728721 in words is "three trillion, three hundred thirteen billion, five hundred one million, seven hundred twenty-eight thousand, seven hundred twenty-one".