12001085646 has 48 divisors (see below), whose sum is σ = 27026095824. Its totient is φ = 3547984000.

The previous prime is 12001085639. The next prime is 12001085647. The reversal of 12001085646 is 64658010021.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001085647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 171825 + ... + 231356.

It is an arithmetic number, because the mean of its divisors is an integer number (563043663).

Almost surely, 2^12001085646 is an apocalyptic number.

12001085646 is an abundant number, since it is smaller than the sum of its proper divisors (15025010178).

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

12001085646 is a wasteful number, since it uses less digits than its factorization.

12001085646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403249 (or 403238 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

Adding to 12001085646 its reverse (64658010021), we get a palindrome (76659095667).

The spelling of 12001085646 in words is "twelve billion, one million, eighty-five thousand, six hundred forty-six".