1227680197787 has 2 divisors, whose sum is σ = 1227680197788. Its totient is φ = 1227680197786.

The previous prime is 1227680197729. The next prime is 1227680197943. The reversal of 1227680197787 is 7877910867221.

It is a weak prime.

It is an emirp because it is prime and its reverse (7877910867221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1227680197787 - 2⁸ = 1227680197531 is a prime.

It is not a weakly prime, because it can be changed into another prime (1227680197727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613840098893 + 613840098894.

It is an arithmetic number, because the mean of its divisors is an integer number (613840098894).

Almost surely, 2^{1227680197787} is an apocalyptic number.

1227680197787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1227680197787 is an equidigital number, since it uses as much as digits as its factorization.

1227680197787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33191424, while the sum is 65.

The spelling of 1227680197787 in words is "one trillion, two hundred twenty-seven billion, six hundred eighty million, one hundred ninety-seven thousand, seven hundred eighty-seven".