12820478589445 has 8 divisors (see below), whose sum is σ = 15384868663320. Its totient is φ = 10256186634240.

The previous prime is 12820478589431. The next prime is 12820478589533. The reversal of 12820478589445 is 54498587402821.

It can be written as a sum of positive squares in 4 ways, for example, as 96318984609 + 12724159604836 = 310353^2 + 3567094^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-12820478589445 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24241900 + ... + 24765109.

It is an arithmetic number, because the mean of its divisors is an integer number (1923108582915).

Almost surely, 2^{12820478589445} is an apocalyptic number.

It is an amenable number.

12820478589445 is a deficient number, since it is larger than the sum of its proper divisors (2564390073875).

12820478589445 is an equidigital number, since it uses as much as digits as its factorization.

12820478589445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49059335.

The product of its (nonzero) digits is 206438400, while the sum is 67.

The spelling of 12820478589445 in words is "twelve trillion, eight hundred twenty billion, four hundred seventy-eight million, five hundred eighty-nine thousand, four hundred forty-five".