9817428665 has 16 divisors (see below), whose sum is σ = 12893791680. Its totient is φ = 7116678720.

The previous prime is 9817428641. The next prime is 9817428679. The reversal of 9817428665 is 5668247189.

It is a happy number.

It is not a de Polignac number, because 9817428665 - 2¹² = 9817424569 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9817428665.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273830 + ... + 307599.

It is an arithmetic number, because the mean of its divisors is an integer number (805861980).

Almost surely, 2^9817428665 is an apocalyptic number.

It is an amenable number.

9817428665 is a deficient number, since it is larger than the sum of its proper divisors (3076363015).

9817428665 is a wasteful number, since it uses less digits than its factorization.

9817428665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581752.

The product of its digits is 5806080, while the sum is 56.

The square root of 9817428665 is about 99082.9383143233. The cubic root of 9817428665 is about 2141.2428120989.

The spelling of 9817428665 in words is "nine billion, eight hundred seventeen million, four hundred twenty-eight thousand, six hundred sixty-five".