9980998666 has 8 divisors (see below), whose sum is σ = 15182364384. Its totient is φ = 4920210540.

The previous prime is 9980998619. The next prime is 9980998681. The reversal of 9980998666 is 6668990899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 9980998595 and 9980998604.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35144220 + ... + 35144503.

It is an arithmetic number, because the mean of its divisors is an integer number (1897795548).

Almost surely, 2^9980998666 is an apocalyptic number.

9980998666 is a deficient number, since it is larger than the sum of its proper divisors (5201365718).

9980998666 is a wasteful number, since it uses less digits than its factorization.

9980998666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70288796.

The product of its (nonzero) digits is 90699264, while the sum is 70.

The square root of 9980998666 is about 99904.9481557345. The cubic root of 9980998666 is about 2153.0692537251.

The spelling of 9980998666 in words is "nine billion, nine hundred eighty million, nine hundred ninety-eight thousand, six hundred sixty-six".