990990000017 has 4 divisors (see below), whose sum is σ = 999759823140. Its totient is φ = 982220176896.

The previous prime is 990990000001. The next prime is 990990000019. The reversal of 990990000017 is 710000099099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 710000099099 = 3079 ⋅230594381.

It can be written as a sum of positive squares in 2 ways, for example, as 13707492241 + 977282507776 = 117079^2 + 988576^2 .

It is a cyclic number.

It is not a de Polignac number, because 990990000017 - 2⁴ = 990990000001 is a prime.

It is a super-2 number, since 2×990990000017² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990990000019) 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, 4384911392 + ... + 4384911617.

It is an arithmetic number, because the mean of its divisors is an integer number (249939955785).

Almost surely, 2^990990000017 is an apocalyptic number.

It is an amenable number.

990990000017 is a deficient number, since it is larger than the sum of its proper divisors (8769823123).

990990000017 is a wasteful number, since it uses less digits than its factorization.

990990000017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8769823122.

The product of its (nonzero) digits is 45927, while the sum is 44.

The spelling of 990990000017 in words is "nine hundred ninety billion, nine hundred ninety million, seventeen", and thus it is an aban number.