16499171617 has 2 divisors, whose sum is σ = 16499171618. Its totient is φ = 16499171616.

The previous prime is 16499171539. The next prime is 16499171621. The reversal of 16499171617 is 71617199461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16292990736 + 206180881 = 127644^2 + 14359^2 .

It is an emirp because it is prime and its reverse (71617199461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16499171617 is a prime.

It is not a weakly prime, because it can be changed into another prime (16499171627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8249585808 + 8249585809.

It is an arithmetic number, because the mean of its divisors is an integer number (8249585809).

Almost surely, 2^16499171617 is an apocalyptic number.

It is an amenable number.

16499171617 is a deficient number, since it is larger than the sum of its proper divisors (1).

16499171617 is an equidigital number, since it uses as much as digits as its factorization.

16499171617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 52.

The spelling of 16499171617 in words is "sixteen billion, four hundred ninety-nine million, one hundred seventy-one thousand, six hundred seventeen".