9980998665 has 32 divisors (see below), whose sum is σ = 17432948736. Its totient is φ = 4836058560.

The previous prime is 9980998619. The next prime is 9980998681. The reversal of 9980998665 is 5668990899.

It is not a de Polignac number, because 9980998665 - 2¹¹ = 9980996617 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 9980998665.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 239254 + ... + 277856.

It is an arithmetic number, because the mean of its divisors is an integer number (544779648).

Almost surely, 2^9980998665 is an apocalyptic number.

It is an amenable number.

9980998665 is a deficient number, since it is larger than the sum of its proper divisors (7451950071).

9980998665 is a wasteful number, since it uses less digits than its factorization.

9980998665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40189.

The product of its (nonzero) digits is 75582720, while the sum is 69.

The square root of 9980998665 is about 99904.9481507298. The cubic root of 9980998665 is about 2153.0692536532.

The spelling of 9980998665 in words is "nine billion, nine hundred eighty million, nine hundred ninety-eight thousand, six hundred sixty-five".