9665785998 has 64 divisors (see below), whose sum is σ = 24003786240. Its totient is φ = 2857579200.

The previous prime is 9665785991. The next prime is 9665786027. The reversal of 9665785998 is 8995875669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9665785991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174090 + ... + 222797.

It is an arithmetic number, because the mean of its divisors is an integer number (375059160).

Almost surely, 2^9665785998 is an apocalyptic number.

9665785998 is an abundant number, since it is smaller than the sum of its proper divisors (14338000242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9665785998 is a wasteful number, since it uses less digits than its factorization.

9665785998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396950 (or 396944 counting only the distinct ones).

The product of its digits is 293932800, while the sum is 72.

The square root of 9665785998 is about 98314.7293033958. The cubic root of 9665785998 is about 2130.1608170584.

The spelling of 9665785998 in words is "nine billion, six hundred sixty-five million, seven hundred eighty-five thousand, nine hundred ninety-eight".