12643772027 has 4 divisors (see below), whose sum is σ = 12645418176. Its totient is φ = 12642125880.

The previous prime is 12643772023. The next prime is 12643772033. The reversal of 12643772027 is 72027734621.

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 12643772027 - 2² = 12643772023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12643772021) 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, 811499 + ... + 826932.

It is an arithmetic number, because the mean of its divisors is an integer number (3161354544).

Almost surely, 2^12643772027 is an apocalyptic number.

12643772027 is a deficient number, since it is larger than the sum of its proper divisors (1646149).

12643772027 is an equidigital number, since it uses as much as digits as its factorization.

12643772027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646148.

The product of its (nonzero) digits is 197568, while the sum is 41.

The spelling of 12643772027 in words is "twelve billion, six hundred forty-three million, seven hundred seventy-two thousand, twenty-seven".