12643227120427 has 4 divisors (see below), whose sum is σ = 12643530742816. Its totient is φ = 12642923498040.

The previous prime is 12643227120389. The next prime is 12643227120431. The reversal of 12643227120427 is 72402172234621.

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

It is a cyclic number.

It is not a de Polignac number, because 12643227120427 - 2¹⁹ = 12643226596139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12643227120127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151748724 + ... + 151832017.

It is an arithmetic number, because the mean of its divisors is an integer number (3160882685704).

Almost surely, 2^{12643227120427} is an apocalyptic number.

12643227120427 is a deficient number, since it is larger than the sum of its proper divisors (303622389).

12643227120427 is an equidigital number, since it uses as much as digits as its factorization.

12643227120427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303622388.

The product of its (nonzero) digits is 451584, while the sum is 43.

The spelling of 12643227120427 in words is "twelve trillion, six hundred forty-three billion, two hundred twenty-seven million, one hundred twenty thousand, four hundred twenty-seven".