12784513805646 has 32 divisors (see below), whose sum is σ = 27905778288000. Its totient is φ = 3872387645280.

The previous prime is 12784513805639. The next prime is 12784513805669. The reversal of 12784513805646 is 64650831548721.

It is a super-2 number, since 2×12784513805646² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12784513805646.

It is a congruent number.

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, 42535296 + ... + 42834803.

It is an arithmetic number, because the mean of its divisors is an integer number (872055571500).

Almost surely, 2^{12784513805646} is an apocalyptic number.

12784513805646 is an abundant number, since it is smaller than the sum of its proper divisors (15121264482354).

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

12784513805646 is a wasteful number, since it uses less digits than its factorization.

12784513805646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85372384.

The product of its (nonzero) digits is 38707200, while the sum is 60.

The spelling of 12784513805646 in words is "twelve trillion, seven hundred eighty-four billion, five hundred thirteen million, eight hundred five thousand, six hundred forty-six".