1272186638791 has 2 divisors, whose sum is σ = 1272186638792. Its totient is φ = 1272186638790.

The previous prime is 1272186638759. The next prime is 1272186638797. The reversal of 1272186638791 is 1978366812721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1272186638791 - 2⁵ = 1272186638759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272186638797) 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 as a sum of consecutive naturals, namely, 636093319395 + 636093319396.

It is an arithmetic number, because the mean of its divisors is an integer number (636093319396).

Almost surely, 2^{1272186638791} is an apocalyptic number.

1272186638791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272186638791 is an equidigital number, since it uses as much as digits as its factorization.

1272186638791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12192768, while the sum is 61.

The spelling of 1272186638791 in words is "one trillion, two hundred seventy-two billion, one hundred eighty-six million, six hundred thirty-eight thousand, seven hundred ninety-one".