12789426649 has 4 divisors (see below), whose sum is σ = 12789833140. Its totient is φ = 12789020160.

The previous prime is 12789426613. The next prime is 12789426679. The reversal of 12789426649 is 94662498721.

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 11031721024 + 1757705625 = 105032^2 + 41925^2 .

It is a cyclic number.

It is not a de Polignac number, because 12789426649 - 2¹⁹ = 12788902361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12789426593 and 12789426602.

It is not an unprimeable number, because it can be changed into a prime (12789426679) 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, 151692 + ... + 220429.

It is an arithmetic number, because the mean of its divisors is an integer number (3197458285).

Almost surely, 2^12789426649 is an apocalyptic number.

It is an amenable number.

12789426649 is a deficient number, since it is larger than the sum of its proper divisors (406491).

12789426649 is an equidigital number, since it uses as much as digits as its factorization.

12789426649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406490.

The product of its digits is 10450944, while the sum is 58.

The spelling of 12789426649 in words is "twelve billion, seven hundred eighty-nine million, four hundred twenty-six thousand, six hundred forty-nine".