9998963666 has 8 divisors (see below), whose sum is σ = 15001374960. Its totient is φ = 4998505348.

The previous prime is 9998963647. The next prime is 9998963671. The reversal of 9998963666 is 6663698999.

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

It is a self number, because there is not a number n which added to its sum of digits gives 9998963666.

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, 475376 + ... + 495963.

It is an arithmetic number, because the mean of its divisors is an integer number (1875171870).

Almost surely, 2^9998963666 is an apocalyptic number.

9998963666 is a deficient number, since it is larger than the sum of its proper divisors (5002411294).

9998963666 is a wasteful number, since it uses less digits than its factorization.

9998963666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976488.

The product of its digits is 204073344, while the sum is 71.

The square root of 9998963666 is about 99994.8181957445. The cubic root of 9998963666 is about 2154.3602636635.

The spelling of 9998963666 in words is "nine billion, nine hundred ninety-eight million, nine hundred sixty-three thousand, six hundred sixty-six".