198800020666 has 16 divisors (see below), whose sum is σ = 321214609800. Its totient is φ = 91732108608.

The previous prime is 198800020651. The next prime is 198800020667. The reversal of 198800020666 is 666020008891.

It can be written as a sum of positive squares in 4 ways, for example, as 186174127441 + 12625893225 = 431479^2 + 112365^2 .

It is not an unprimeable number, because it can be changed into a prime (198800020667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 794061 + ... + 1013968.

Almost surely, 2^198800020666 is an apocalyptic number.

198800020666 is a deficient number, since it is larger than the sum of its proper divisors (122414589134).

198800020666 is a wasteful number, since it uses less digits than its factorization.

198800020666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812273.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 198800020666 in words is "one hundred ninety-eight billion, eight hundred million, twenty thousand, six hundred sixty-six".