1641530720717 has 2 divisors, whose sum is σ = 1641530720718. Its totient is φ = 1641530720716.

The previous prime is 1641530720707. The next prime is 1641530720743. The reversal of 1641530720717 is 7170270351461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1506851996521 + 134678724196 = 1227539^2 + 366986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641530720717 - 2¹⁰ = 1641530719693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641530720707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820765360358 + 820765360359.

It is an arithmetic number, because the mean of its divisors is an integer number (820765360359).

Almost surely, 2^{1641530720717} is an apocalyptic number.

It is an amenable number.

1641530720717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641530720717 is an equidigital number, since it uses as much as digits as its factorization.

1641530720717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 1641530720717 in words is "one trillion, six hundred forty-one billion, five hundred thirty million, seven hundred twenty thousand, seven hundred seventeen".