12001819681 has 8 divisors (see below), whose sum is σ = 13260322944. Its totient is φ = 10804706880.

The previous prime is 12001819667. The next prime is 12001819693. The reversal of 12001819681 is 18691810021.

12001819681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12001819681 - 2⁷ = 12001819553 is a prime.

It is a super-2 number, since 2×12001819681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12001819681.

It is not an unprimeable number, because it can be changed into a prime (12061819681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15347205 + ... + 15347986.

It is an arithmetic number, because the mean of its divisors is an integer number (1657540368).

Almost surely, 2^12001819681 is an apocalyptic number.

It is an amenable number.

12001819681 is a deficient number, since it is larger than the sum of its proper divisors (1258503263).

12001819681 is a wasteful number, since it uses less digits than its factorization.

12001819681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30695231.

The product of its (nonzero) digits is 6912, while the sum is 37.

The spelling of 12001819681 in words is "twelve billion, one million, eight hundred nineteen thousand, six hundred eighty-one".