12805615779 has 8 divisors (see below), whose sum is σ = 18626350272. Its totient is φ = 7760979240.

The previous prime is 12805615759. The next prime is 12805615793. The reversal of 12805615779 is 97751650821.

12805615779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12805615779 - 2⁸ = 12805615523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12805615709) 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 7 ways as a sum of consecutive naturals, for example, 194024449 + ... + 194024514.

It is an arithmetic number, because the mean of its divisors is an integer number (2328293784).

Almost surely, 2^12805615779 is an apocalyptic number.

12805615779 is a deficient number, since it is larger than the sum of its proper divisors (5820734493).

12805615779 is a wasteful number, since it uses less digits than its factorization.

12805615779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388048977.

The product of its (nonzero) digits is 1058400, while the sum is 51.

The spelling of 12805615779 in words is "twelve billion, eight hundred five million, six hundred fifteen thousand, seven hundred seventy-nine".