12398779693 has 2 divisors, whose sum is σ = 12398779694. Its totient is φ = 12398779692.

The previous prime is 12398779639. The next prime is 12398779697. The reversal of 12398779693 is 39697789321.

It is a happy number.

12398779693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (12398779639) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12368331369 + 30448324 = 111213^2 + 5518^2 .

It is a cyclic number.

It is not a de Polignac number, because 12398779693 - 2¹⁷ = 12398648621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12398779697) 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, 6199389846 + 6199389847.

It is an arithmetic number, because the mean of its divisors is an integer number (6199389847).

Almost surely, 2^12398779693 is an apocalyptic number.

It is an amenable number.

12398779693 is a deficient number, since it is larger than the sum of its proper divisors (1).

12398779693 is an equidigital number, since it uses as much as digits as its factorization.

12398779693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30862944, while the sum is 64.

The spelling of 12398779693 in words is "twelve billion, three hundred ninety-eight million, seven hundred seventy-nine thousand, six hundred ninety-three".