12001019985 has 24 divisors (see below), whose sum is σ = 20804345640. Its totient is φ = 6399750912.

The previous prime is 12001019983. The next prime is 12001019993. The reversal of 12001019985 is 58991010021.

It can be written as a sum of positive squares in 4 ways, for example, as 168584256 + 11832435729 = 12984^2 + 108777^2 .

It is not a de Polignac number, because 12001019985 - 2¹ = 12001019983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12001019981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 620887 + ... + 639923.

It is an arithmetic number, because the mean of its divisors is an integer number (866847735).

Almost surely, 2^12001019985 is an apocalyptic number.

12001019985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12001019985 is a deficient number, since it is larger than the sum of its proper divisors (8803325655).

12001019985 is a wasteful number, since it uses less digits than its factorization.

12001019985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33057 (or 33054 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The spelling of 12001019985 in words is "twelve billion, one million, nineteen thousand, nine hundred eighty-five".