12785781982 has 4 divisors (see below), whose sum is σ = 19178672976. Its totient is φ = 6392890990.

The previous prime is 12785781979. The next prime is 12785782007. The reversal of 12785781982 is 28918758721.

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

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

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, 3196445494 + ... + 3196445497.

It is an arithmetic number, because the mean of its divisors is an integer number (4794668244).

Almost surely, 2^12785781982 is an apocalyptic number.

12785781982 is a deficient number, since it is larger than the sum of its proper divisors (6392890994).

12785781982 is an equidigital number, since it uses as much as digits as its factorization.

12785781982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6392890993.

The product of its digits is 4515840, while the sum is 58.

The spelling of 12785781982 in words is "twelve billion, seven hundred eighty-five million, seven hundred eighty-one thousand, nine hundred eighty-two".