12947784842 has 4 divisors (see below), whose sum is σ = 19421677266. Its totient is φ = 6473892420.

The previous prime is 12947784797. The next prime is 12947784917. The reversal of 12947784842 is 24848774921.

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

It can be written as a sum of positive squares in only one way, i.e., 9967825921 + 2979958921 = 99839^2 + 54589^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3236946209 + ... + 3236946212.

Almost surely, 2^12947784842 is an apocalyptic number.

12947784842 is a deficient number, since it is larger than the sum of its proper divisors (6473892424).

12947784842 is an equidigital number, since it uses as much as digits as its factorization.

12947784842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6473892423.

The product of its digits is 7225344, while the sum is 56.

The spelling of 12947784842 in words is "twelve billion, nine hundred forty-seven million, seven hundred eighty-four thousand, eight hundred forty-two".