12278666784 has 48 divisors (see below), whose sum is σ = 32516763552. Its totient is φ = 4056665088.

The previous prime is 12278666779. The next prime is 12278666801. The reversal of 12278666784 is 48766687221.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555094 + ... + 576789.

It is an arithmetic number, because the mean of its divisors is an integer number (677432574).

Almost surely, 2^12278666784 is an apocalyptic number.

It is an amenable number.

12278666784 is an abundant number, since it is smaller than the sum of its proper divisors (20238096768).

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

12278666784 is a wasteful number, since it uses less digits than its factorization.

12278666784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132009 (or 1132001 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 57.

The spelling of 12278666784 in words is "twelve billion, two hundred seventy-eight million, six hundred sixty-six thousand, seven hundred eighty-four".