12798989899 has 4 divisors (see below), whose sum is σ = 12799434400. Its totient is φ = 12798545400.

The previous prime is 12798989897. The next prime is 12798989909. The reversal of 12798989899 is 99898989721.

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

It is a cyclic number.

It is not a de Polignac number, because 12798989899 - 2¹ = 12798989897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12798989897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175827 + ... + 237724.

It is an arithmetic number, because the mean of its divisors is an integer number (3199858600).

Almost surely, 2^12798989899 is an apocalyptic number.

12798989899 is a deficient number, since it is larger than the sum of its proper divisors (444501).

12798989899 is an equidigital number, since it uses as much as digits as its factorization.

12798989899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444500.

The product of its digits is 423263232, while the sum is 79.

The spelling of 12798989899 in words is "twelve billion, seven hundred ninety-eight million, nine hundred eighty-nine thousand, eight hundred ninety-nine".