12878694394 has 4 divisors (see below), whose sum is σ = 19318041594. Its totient is φ = 6439347196.

The previous prime is 12878694379. The next prime is 12878694397. The reversal of 12878694394 is 49349687821.

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., 10917533169 + 1961161225 = 104487^2 + 44285^2 .

It is not an unprimeable number, because it can be changed into a prime (12878694397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3219673597 + ... + 3219673600.

Almost surely, 2^12878694394 is an apocalyptic number.

12878694394 is a deficient number, since it is larger than the sum of its proper divisors (6439347200).

12878694394 is an equidigital number, since it uses as much as digits as its factorization.

12878694394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6439347199.

The product of its digits is 20901888, while the sum is 61.

The spelling of 12878694394 in words is "twelve billion, eight hundred seventy-eight million, six hundred ninety-four thousand, three hundred ninety-four".