12784441646 has 4 divisors (see below), whose sum is σ = 19176662472. Its totient is φ = 6392220822.

The previous prime is 12784441627. The next prime is 12784441651. The reversal of 12784441646 is 64614448721.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12784441646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3196110410 + ... + 3196110413.

It is an arithmetic number, because the mean of its divisors is an integer number (4794165618).

Almost surely, 2^12784441646 is an apocalyptic number.

12784441646 is a deficient number, since it is larger than the sum of its proper divisors (6392220826).

12784441646 is an equidigital number, since it uses as much as digits as its factorization.

12784441646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6392220825.

The product of its digits is 1032192, while the sum is 47.

The spelling of 12784441646 in words is "twelve billion, seven hundred eighty-four million, four hundred forty-one thousand, six hundred forty-six".