12698808649 has 4 divisors (see below), whose sum is σ = 12699432720. Its totient is φ = 12698184580.

The previous prime is 12698808643. The next prime is 12698808671. The reversal of 12698808649 is 94680889621.

12698808649 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94680889621 = 1039 ⋅91126939.

It is a cyclic number.

It is not a de Polignac number, because 12698808649 - 2¹⁷ = 12698677577 is a prime.

It is a super-2 number, since 2×12698808649² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12698808643) 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, 280447 + ... + 322564.

It is an arithmetic number, because the mean of its divisors is an integer number (3174858180).

Almost surely, 2^12698808649 is an apocalyptic number.

It is an amenable number.

12698808649 is a deficient number, since it is larger than the sum of its proper divisors (624071).

12698808649 is an equidigital number, since it uses as much as digits as its factorization.

12698808649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624070.

The product of its (nonzero) digits is 11943936, while the sum is 61.

The spelling of 12698808649 in words is "twelve billion, six hundred ninety-eight million, eight hundred eight thousand, six hundred forty-nine".