12784513805645 has 32 divisors (see below), whose sum is σ = 15868855715328. Its totient is φ = 9881755481088.

The previous prime is 12784513805639. The next prime is 12784513805669. The reversal of 12784513805645 is 54650831548721.

It is a cyclic number.

It is not a de Polignac number, because 12784513805645 - 2²⁰ = 12784512757069 is a prime.

It is a super-3 number, since 3×12784513805645³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25045307 + ... + 25550663.

It is an arithmetic number, because the mean of its divisors is an integer number (495901741104).

Almost surely, 2^{12784513805645} is an apocalyptic number.

It is an amenable number.

12784513805645 is a deficient number, since it is larger than the sum of its proper divisors (3084341909683).

12784513805645 is a wasteful number, since it uses less digits than its factorization.

12784513805645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506789.

The product of its (nonzero) digits is 32256000, while the sum is 59.

The spelling of 12784513805645 in words is "twelve trillion, seven hundred eighty-four billion, five hundred thirteen million, eight hundred five thousand, six hundred forty-five".