9917804342489 has 4 divisors (see below), whose sum is σ = 9920328603060. Its totient is φ = 9915280081920.

The previous prime is 9917804342437. The next prime is 9917804342527. The reversal of 9917804342489 is 9842434087199.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4125334712464 + 5792469630025 = 2031092^2 + 2406755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9917804342489 is a prime.

It is a super-2 number, since 2×9917804342489² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9917804342689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1262124392 + ... + 1262132249.

It is an arithmetic number, because the mean of its divisors is an integer number (2480082150765).

Almost surely, 2^{9917804342489} is an apocalyptic number.

It is an amenable number.

9917804342489 is a deficient number, since it is larger than the sum of its proper divisors (2524260571).

9917804342489 is a wasteful number, since it uses less digits than its factorization.

9917804342489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524260570.

The product of its (nonzero) digits is 125411328, while the sum is 68.

The spelling of 9917804342489 in words is "nine trillion, nine hundred seventeen billion, eight hundred four million, three hundred forty-two thousand, four hundred eighty-nine".