12778937854 has 4 divisors (see below), whose sum is σ = 19168406784. Its totient is φ = 6389468926.

The previous prime is 12778937849. The next prime is 12778937867. The reversal of 12778937854 is 45873987721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45873987721 = 389 ⋅117927989.

It is a junction number, because it is equal to n+sod(n) for n = 12778937792 and 12778937801.

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, 3194734462 + ... + 3194734465.

It is an arithmetic number, because the mean of its divisors is an integer number (4792101696).

Almost surely, 2^12778937854 is an apocalyptic number.

12778937854 is a deficient number, since it is larger than the sum of its proper divisors (6389468930).

12778937854 is an equidigital number, since it uses as much as digits as its factorization.

12778937854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6389468929.

The product of its digits is 23708160, while the sum is 61.

The spelling of 12778937854 in words is "twelve billion, seven hundred seventy-eight million, nine hundred thirty-seven thousand, eight hundred fifty-four".