12784513805644 has 48 divisors (see below), whose sum is σ = 25714101369600. Its totient is φ = 5447995425216.

The previous prime is 12784513805639. The next prime is 12784513805669. The reversal of 12784513805644 is 44650831548721.

It is a happy number.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61056922 + ... + 61265950.

It is an arithmetic number, because the mean of its divisors is an integer number (535710445200).

Almost surely, 2^{12784513805644} is an apocalyptic number.

12784513805644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

12784513805644 is an abundant number, since it is smaller than the sum of its proper divisors (12929587563956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12784513805644 is a wasteful number, since it uses less digits than its factorization.

12784513805644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221422 (or 221420 counting only the distinct ones).

The product of its (nonzero) digits is 25804800, while the sum is 58.

The spelling of 12784513805644 in words is "twelve trillion, seven hundred eighty-four billion, five hundred thirteen million, eight hundred five thousand, six hundred forty-four".