198563209857 has 12 divisors (see below), whose sum is σ = 286817987664. Its totient is φ = 132373413720.

The previous prime is 198563209853. The next prime is 198563209861. The reversal of 198563209857 is 758902365891.

198563209857 is a `hidden beast` number, since 19 + 8 + 563 + 2 + 0 + 9 + 8 + 57 = 666.

It is an interprime number because it is at equal distance from previous prime (198563209853) and next prime (198563209861).

It is not a de Polignac number, because 198563209857 - 2² = 198563209853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198563209794 and 198563209803.

It is not an unprimeable number, because it can be changed into a prime (198563209853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 641982 + ... + 899592.

It is an arithmetic number, because the mean of its divisors is an integer number (23901498972).

Almost surely, 2^198563209857 is an apocalyptic number.

It is an amenable number.

198563209857 is a deficient number, since it is larger than the sum of its proper divisors (88254777807).

198563209857 is a wasteful number, since it uses less digits than its factorization.

198563209857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343260 (or 343257 counting only the distinct ones).

The product of its (nonzero) digits is 32659200, while the sum is 63.

The spelling of 198563209857 in words is "one hundred ninety-eight billion, five hundred sixty-three million, two hundred nine thousand, eight hundred fifty-seven".