12201720661647 has 192 divisors, whose sum is σ = 20644611886080. Its totient is φ = 7137590400000.

The previous prime is 12201720661591. The next prime is 12201720661651. The reversal of 12201720661647 is 74616602710221.

12201720661647 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 1 + 7 + 20 + 6 + 616 + 4 + 7 = 666.

It is not a de Polignac number, because 12201720661647 - 2¹¹ = 12201720659599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201720669647) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 4451556697 + ... + 4451559437.

It is an arithmetic number, because the mean of its divisors is an integer number (107524020240).

Almost surely, 2^{12201720661647} is an apocalyptic number.

12201720661647 is a deficient number, since it is larger than the sum of its proper divisors (8442891224433).

12201720661647 is a wasteful number, since it uses less digits than its factorization.

12201720661647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3228 (or 3216 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 12201720661647 in words is "twelve trillion, two hundred one billion, seven hundred twenty million, six hundred sixty-one thousand, six hundred forty-seven".