199685720850 has 192 divisors, whose sum is σ = 618756682752. Its totient is φ = 41403168000.

The previous prime is 199685720791. The next prime is 199685720867. The reversal of 199685720850 is 58027586991.

199685720850 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×199685720850² (a number of 23 digits) contains 22 as substring.

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 95 ways as a sum of consecutive naturals, for example, 5375340 + ... + 5412360.

It is an arithmetic number, because the mean of its divisors is an integer number (3222691056).

Almost surely, 2^199685720850 is an apocalyptic number.

199685720850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 199685720850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309378341376).

199685720850 is an abundant number, since it is smaller than the sum of its proper divisors (419070961902).

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

199685720850 is a wasteful number, since it uses less digits than its factorization.

199685720850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37521 (or 37516 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 60.

The spelling of 199685720850 in words is "one hundred ninety-nine billion, six hundred eighty-five million, seven hundred twenty thousand, eight hundred fifty".