12005646565439 has 4 divisors (see below), whose sum is σ = 12006076179624. Its totient is φ = 12005216951256.

The previous prime is 12005646565411. The next prime is 12005646565453. The reversal of 12005646565439 is 93456564650021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12005646565439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12005646565459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214765172 + ... + 214821065.

It is an arithmetic number, because the mean of its divisors is an integer number (3001519044906).

Almost surely, 2^{12005646565439} is an apocalyptic number.

12005646565439 is a deficient number, since it is larger than the sum of its proper divisors (429614185).

12005646565439 is an equidigital number, since it uses as much as digits as its factorization.

12005646565439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429614184.

The product of its (nonzero) digits is 23328000, while the sum is 56.

The spelling of 12005646565439 in words is "twelve trillion, five billion, six hundred forty-six million, five hundred sixty-five thousand, four hundred thirty-nine".