12778666384 has 80 divisors (see below), whose sum is σ = 27744742080. Its totient is φ = 5651412480.

The previous prime is 12778666367. The next prime is 12778666421. The reversal of 12778666384 is 48366687721.

It is a super-3 number, since 3×12778666384³ (a number of 31 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2032654 + ... + 2038930.

It is an arithmetic number, because the mean of its divisors is an integer number (346809276).

Almost surely, 2^12778666384 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12778666384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13872371040).

12778666384 is an abundant number, since it is smaller than the sum of its proper divisors (14966075696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12778666384 is a wasteful number, since it uses less digits than its factorization.

12778666384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6608 (or 6602 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 58.

The spelling of 12778666384 in words is "twelve billion, seven hundred seventy-eight million, six hundred sixty-six thousand, three hundred eighty-four".