12720001289761 has 4 divisors (see below), whose sum is σ = 12720132010800. Its totient is φ = 12719870568724.

The previous prime is 12720001289747. The next prime is 12720001289819. The reversal of 12720001289761 is 16798210002721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12720001289761 - 2³³ = 12711411355169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12720001289731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65214451 + ... + 65409208.

It is an arithmetic number, because the mean of its divisors is an integer number (3180033002700).

Almost surely, 2^{12720001289761} is an apocalyptic number.

It is an amenable number.

12720001289761 is a deficient number, since it is larger than the sum of its proper divisors (130721039).

12720001289761 is an equidigital number, since it uses as much as digits as its factorization.

12720001289761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130721038.

The product of its (nonzero) digits is 169344, while the sum is 46.

The spelling of 12720001289761 in words is "twelve trillion, seven hundred twenty billion, one million, two hundred eighty-nine thousand, seven hundred sixty-one".