12820478589447 has 16 divisors (see below), whose sum is σ = 17468577510912. Its totient is φ = 8359909875200.

The previous prime is 12820478589431. The next prime is 12820478589533. The reversal of 12820478589447 is 74498587402821.

It is a cyclic number.

It is not a de Polignac number, because 12820478589447 - 2⁴ = 12820478589431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12820478589427) 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 15 ways as a sum of consecutive naturals, for example, 28170693 + ... + 28622174.

It is an arithmetic number, because the mean of its divisors is an integer number (1091786094432).

Almost surely, 2^{12820478589447} is an apocalyptic number.

12820478589447 is a deficient number, since it is larger than the sum of its proper divisors (4648098921465).

12820478589447 is a wasteful number, since it uses less digits than its factorization.

12820478589447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56794518.

The product of its (nonzero) digits is 289013760, while the sum is 69.

The spelling of 12820478589447 in words is "twelve trillion, eight hundred twenty billion, four hundred seventy-eight million, five hundred eighty-nine thousand, four hundred forty-seven".