198749985774 has 16 divisors (see below), whose sum is σ = 397936316160. Its totient is φ = 66177271160.

The previous prime is 198749985701. The next prime is 198749985779. The reversal of 198749985774 is 477589947891.

It is a self number, because there is not a number n which added to its sum of digits gives 198749985774.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198749985779) 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, 18175104 + ... + 18186035.

It is an arithmetic number, because the mean of its divisors is an integer number (24871019760).

Almost surely, 2^198749985774 is an apocalyptic number.

198749985774 is an abundant number, since it is smaller than the sum of its proper divisors (199186330386).

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

198749985774 is a wasteful number, since it uses less digits than its factorization.

198749985774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36362055.

The product of its digits is 1280240640, while the sum is 78.

The spelling of 198749985774 in words is "one hundred ninety-eight billion, seven hundred forty-nine million, nine hundred eighty-five thousand, seven hundred seventy-four".