199779508845 has 48 divisors (see below), whose sum is σ = 406449763200. Its totient is φ = 88859452032.

The previous prime is 199779508813. The next prime is 199779508871. The reversal of 199779508845 is 548805977991.

It is a happy number.

199779508845 is a `hidden beast` number, since 1 + 9 + 9 + 7 + 79 + 508 + 8 + 45 = 666.

199779508845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 199779508845 - 2⁵ = 199779508813 is a prime.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 8558895 + ... + 8582204.

It is an arithmetic number, because the mean of its divisors is an integer number (8467703400).

Almost surely, 2^199779508845 is an apocalyptic number.

199779508845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199779508845 is an abundant number, since it is smaller than the sum of its proper divisors (206670254355).

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

199779508845 is a wasteful number, since it uses less digits than its factorization.

199779508845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17141154 (or 17141151 counting only the distinct ones).

The product of its (nonzero) digits is 228614400, while the sum is 72.

The spelling of 199779508845 in words is "one hundred ninety-nine billion, seven hundred seventy-nine million, five hundred eight thousand, eight hundred forty-five".