199212011985 has 48 divisors (see below), whose sum is σ = 382738908672. Its totient is φ = 88130649600.

The previous prime is 199212011969. The next prime is 199212011987. The reversal of 199212011985 is 589110212991.

199212011985 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 199212011985 - 2⁴ = 199212011969 is a prime.

It is a super-2 number, since 2×199212011985² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199212011987) 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 47 ways as a sum of consecutive naturals, for example, 4348776 + ... + 4394345.

It is an arithmetic number, because the mean of its divisors is an integer number (7973727264).

Almost surely, 2^199212011985 is an apocalyptic number.

199212011985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199212011985 is a deficient number, since it is larger than the sum of its proper divisors (183526896687).

199212011985 is a wasteful number, since it uses less digits than its factorization.

199212011985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8743174 (or 8743167 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 48.

The spelling of 199212011985 in words is "one hundred ninety-nine billion, two hundred twelve million, eleven thousand, nine hundred eighty-five".