1272237687689 has 2 divisors, whose sum is σ = 1272237687690. Its totient is φ = 1272237687688.

The previous prime is 1272237687647. The next prime is 1272237687691. The reversal of 1272237687689 is 9867867322721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1087223290000 + 185014397689 = 1042700^2 + 430133^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272237687689 - 2⁸ = 1272237687433 is a prime.

Together with 1272237687691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1272237687089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636118843844 + 636118843845.

It is an arithmetic number, because the mean of its divisors is an integer number (636118843845).

Almost surely, 2^{1272237687689} is an apocalyptic number.

It is an amenable number.

1272237687689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272237687689 is an equidigital number, since it uses as much as digits as its factorization.

1272237687689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 170698752, while the sum is 68.

The spelling of 1272237687689 in words is "one trillion, two hundred seventy-two billion, two hundred thirty-seven million, six hundred eighty-seven thousand, six hundred eighty-nine".