1617340702721 has 2 divisors, whose sum is σ = 1617340702722. Its totient is φ = 1617340702720.

The previous prime is 1617340702699. The next prime is 1617340702741. The reversal of 1617340702721 is 1272070437161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1569570480625 + 47770222096 = 1252825^2 + 218564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1617340702721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1617340702741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808670351360 + 808670351361.

It is an arithmetic number, because the mean of its divisors is an integer number (808670351361).

Almost surely, 2^{1617340702721} is an apocalyptic number.

It is an amenable number.

1617340702721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1617340702721 is an equidigital number, since it uses as much as digits as its factorization.

1617340702721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 41.

The spelling of 1617340702721 in words is "one trillion, six hundred seventeen billion, three hundred forty million, seven hundred two thousand, seven hundred twenty-one".