198883691666 has 16 divisors (see below), whose sum is σ = 325499240448. Its totient is φ = 90386900400.

The previous prime is 198883691663. The next prime is 198883691701. The reversal of 198883691666 is 666196388891.

It is a self number, because there is not a number n which added to its sum of digits gives 198883691666.

It is not an unprimeable number, because it can be changed into a prime (198883691663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 600665 + ... + 870956.

It is an arithmetic number, because the mean of its divisors is an integer number (20343702528).

Almost surely, 2^198883691666 is an apocalyptic number.

198883691666 is a deficient number, since it is larger than the sum of its proper divisors (126615548782).

198883691666 is a wasteful number, since it uses less digits than its factorization.

198883691666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477777.

The product of its digits is 161243136, while the sum is 71.

The spelling of 198883691666 in words is "one hundred ninety-eight billion, eight hundred eighty-three million, six hundred ninety-one thousand, six hundred sixty-six".