17697443889889 has 9 divisors (see below), whose sum is σ = 17767658929017. Its totient is φ = 17627505291264.

The previous prime is 17697443889859. The next prime is 17697443889943. The reversal of 17697443889889 is 98898834479671.

The square root of 17697443889889 is 4206833.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 3625882430625 + 14071561459264 = 1904175^2 + 3751208^2 .

It is not a de Polignac number, because 17697443889889 - 2¹⁷ = 17697443758817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17697443889859) 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 in 8 ways as a sum of consecutive naturals, for example, 1081147897 + ... + 1081164265.

Almost surely, 2^{17697443889889} is an apocalyptic number.

17697443889889 is the 4206833-rd square number.

17697443889889 is the 2103417-th centered octagonal number.

It is an amenable number.

17697443889889 is a deficient number, since it is larger than the sum of its proper divisors (70215039128).

17697443889889 is an frugal number, since it uses more digits than its factorization.

17697443889889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33252 (or 16626 counting only the distinct ones).

The product of its digits is 42138206208, while the sum is 91.

The spelling of 17697443889889 in words is "seventeen trillion, six hundred ninety-seven billion, four hundred forty-three million, eight hundred eighty-nine thousand, eight hundred eighty-nine".