16859441617 has 2 divisors, whose sum is σ = 16859441618. Its totient is φ = 16859441616.

The previous prime is 16859441609. The next prime is 16859441659. The reversal of 16859441617 is 71614495861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14738931216 + 2120510401 = 121404^2 + 46049^2 .

It is a cyclic number.

It is not a de Polignac number, because 16859441617 - 2³ = 16859441609 is a prime.

It is not a weakly prime, because it can be changed into another prime (16859442617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8429720808 + 8429720809.

It is an arithmetic number, because the mean of its divisors is an integer number (8429720809).

Almost surely, 2^16859441617 is an apocalyptic number.

It is an amenable number.

16859441617 is a deficient number, since it is larger than the sum of its proper divisors (1).

16859441617 is an equidigital number, since it uses as much as digits as its factorization.

16859441617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 52.

The spelling of 16859441617 in words is "sixteen billion, eight hundred fifty-nine million, four hundred forty-one thousand, six hundred seventeen".