12644388187 has 2 divisors, whose sum is σ = 12644388188. Its totient is φ = 12644388186.

The previous prime is 12644388101. The next prime is 12644388209. The reversal of 12644388187 is 78188344621.

It is a strong prime.

It is an emirp because it is prime and its reverse (78188344621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12644388187 - 2⁷ = 12644388059 is a prime.

It is not a weakly prime, because it can be changed into another prime (12644388587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6322194093 + 6322194094.

It is an arithmetic number, because the mean of its divisors is an integer number (6322194094).

Almost surely, 2^12644388187 is an apocalyptic number.

12644388187 is a deficient number, since it is larger than the sum of its proper divisors (1).

12644388187 is an equidigital number, since it uses as much as digits as its factorization.

12644388187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2064384, while the sum is 52.

The spelling of 12644388187 in words is "twelve billion, six hundred forty-four million, three hundred eighty-eight thousand, one hundred eighty-seven".