198197131866 has 32 divisors (see below), whose sum is σ = 401524611840. Its totient is φ = 65211122496.

The previous prime is 198197131831. The next prime is 198197131883. The reversal of 198197131866 is 668131791891.

198197131866 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1686040 + ... + 1799756.

It is an arithmetic number, because the mean of its divisors is an integer number (12547644120).

Almost surely, 2^198197131866 is an apocalyptic number.

198197131866 is an abundant number, since it is smaller than the sum of its proper divisors (203327479974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198197131866 is a wasteful number, since it uses less digits than its factorization.

198197131866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117478.

The product of its digits is 3919104, while the sum is 60.

The spelling of 198197131866 in words is "one hundred ninety-eight billion, one hundred ninety-seven million, one hundred thirty-one thousand, eight hundred sixty-six".