198785251999 has 4 divisors (see below), whose sum is σ = 199271279920. Its totient is φ = 198299224080.

The previous prime is 198785251979. The next prime is 198785252063. The reversal of 198785251999 is 999152587891.

198785251999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198785251999 - 2⁵ = 198785251967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198785251979) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 243013347 + ... + 243014164.

It is an arithmetic number, because the mean of its divisors is an integer number (49817819980).

Almost surely, 2^198785251999 is an apocalyptic number.

198785251999 is a deficient number, since it is larger than the sum of its proper divisors (486027921).

198785251999 is an equidigital number, since it uses as much as digits as its factorization.

198785251999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486027920.

The product of its digits is 146966400, while the sum is 73.

The spelling of 198785251999 in words is "one hundred ninety-eight billion, seven hundred eighty-five million, two hundred fifty-one thousand, nine hundred ninety-nine".