216171702171617 has 2 divisors, whose sum is σ = 216171702171618. Its totient is φ = 216171702171616.

The previous prime is 216171702171569. The next prime is 216171702171631. The reversal of 216171702171617 is 716171207171612.

216171702171617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215020021200721 + 1151680970896 = 14663561^2 + 1073164^2 .

It is a cyclic number.

It is not a de Polignac number, because 216171702171617 - 2¹² = 216171702167521 is a prime.

It is not a weakly prime, because it can be changed into another prime (216171702171647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108085851085808 + 108085851085809.

It is an arithmetic number, because the mean of its divisors is an integer number (108085851085809).

Almost surely, 2^{216171702171617} is an apocalyptic number.

It is an amenable number.

216171702171617 is a deficient number, since it is larger than the sum of its proper divisors (1).

216171702171617 is an equidigital number, since it uses as much as digits as its factorization.

216171702171617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345744, while the sum is 50.

The spelling of 216171702171617 in words is "two hundred sixteen trillion, one hundred seventy-one billion, seven hundred two million, one hundred seventy-one thousand, six hundred seventeen".