3163305456721 has 2 divisors, whose sum is σ = 3163305456722. Its totient is φ = 3163305456720.

The previous prime is 3163305456719. The next prime is 3163305456763. The reversal of 3163305456721 is 1276545033613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2741461701696 + 421843755025 = 1655736^2 + 649495^2 .

It is a cyclic number.

It is not a de Polignac number, because 3163305456721 - 2¹ = 3163305456719 is a prime.

Together with 3163305456719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3163305451721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1581652728360 + 1581652728361.

It is an arithmetic number, because the mean of its divisors is an integer number (1581652728361).

Almost surely, 2^{3163305456721} is an apocalyptic number.

It is an amenable number.

3163305456721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3163305456721 is an equidigital number, since it uses as much as digits as its factorization.

3163305456721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 46.

The spelling of 3163305456721 in words is "three trillion, one hundred sixty-three billion, three hundred five million, four hundred fifty-six thousand, seven hundred twenty-one".