999999999617 has 2 divisors, whose sum is σ = 999999999618. Its totient is φ = 999999999616.

The previous prime is 999999999611. The next prime is 999999999673. The reversal of 999999999617 is 716999999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 751349174416 + 248650825201 = 866804^2 + 498649^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999999617 - 2¹⁶ = 999999934081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999999999617.

It is not a weakly prime, because it can be changed into another prime (999999999611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999999808 + 499999999809.

It is an arithmetic number, because the mean of its divisors is an integer number (499999999809).

Almost surely, 2^999999999617 is an apocalyptic number.

It is an amenable number.

999999999617 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999999617 is an equidigital number, since it uses as much as digits as its factorization.

999999999617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16271660538, while the sum is 95.

The spelling of 999999999617 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred seventeen".