12006617981 has 8 divisors (see below), whose sum is σ = 12414415104. Its totient is φ = 11604294880.

The previous prime is 12006617977. The next prime is 12006617989. The reversal of 12006617981 is 18971660021.

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 12006617981 - 2² = 12006617977 is a prime.

It is a super-2 number, since 2×12006617981² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12006617989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1364045 + ... + 1372818.

It is an arithmetic number, because the mean of its divisors is an integer number (1551801888).

Almost surely, 2^12006617981 is an apocalyptic number.

It is an amenable number.

12006617981 is a deficient number, since it is larger than the sum of its proper divisors (407797123).

12006617981 is a wasteful number, since it uses less digits than its factorization.

12006617981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737011.

The product of its (nonzero) digits is 36288, while the sum is 41.

The spelling of 12006617981 in words is "twelve billion, six million, six hundred seventeen thousand, nine hundred eighty-one".