12005095520781 has 48 divisors (see below), whose sum is σ = 19147680759168. Its totient is φ = 7247503042560.

The previous prime is 12005095520779. The next prime is 12005095520801. The reversal of 12005095520781 is 18702559050021.

12005095520781 is a `hidden beast` number, since 1 + 2 + 0 + 0 + 50 + 9 + 5 + 520 + 78 + 1 = 666.

It is not a de Polignac number, because 12005095520781 - 2¹ = 12005095520779 is a prime.

It is a super-2 number, since 2×12005095520781² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12005095520381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1128840 + ... + 5028366.

It is an arithmetic number, because the mean of its divisors is an integer number (398910015816).

Almost surely, 2^{12005095520781} is an apocalyptic number.

12005095520781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12005095520781 is a deficient number, since it is larger than the sum of its proper divisors (7142585238387).

12005095520781 is a wasteful number, since it uses less digits than its factorization.

12005095520781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3899823 (or 3899798 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 45.

The spelling of 12005095520781 in words is "twelve trillion, five billion, ninety-five million, five hundred twenty thousand, seven hundred eighty-one".