12398785897 has 4 divisors (see below), whose sum is σ = 12508509780. Its totient is φ = 12289062016.

The previous prime is 12398785891. The next prime is 12398786041. The reversal of 12398785897 is 79858789321.

12398785897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3529666921 + 8869118976 = 59411^2 + 94176^2 .

It is a cyclic number.

It is not a de Polignac number, because 12398785897 - 2¹⁹ = 12398261609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12398785891) 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 in 3 ways as a sum of consecutive naturals, for example, 54861772 + ... + 54861997.

It is an arithmetic number, because the mean of its divisors is an integer number (3127127445).

Almost surely, 2^12398785897 is an apocalyptic number.

It is an amenable number.

12398785897 is a deficient number, since it is larger than the sum of its proper divisors (109723883).

12398785897 is a wasteful number, since it uses less digits than its factorization.

12398785897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109723882.

The product of its digits is 60963840, while the sum is 67.

The spelling of 12398785897 in words is "twelve billion, three hundred ninety-eight million, seven hundred eighty-five thousand, eight hundred ninety-seven".