12774777786 has 96 divisors (see below), whose sum is σ = 30353895936. Its totient is φ = 4020192000.

The previous prime is 12774777749. The next prime is 12774777793. The reversal of 12774777786 is 68777747721.

12774777786 is a `hidden beast` number, since 12 + 7 + 7 + 477 + 77 + 86 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 607366 + ... + 628046.

It is an arithmetic number, because the mean of its divisors is an integer number (316186416).

Almost surely, 2^12774777786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12774777786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15176947968).

12774777786 is an abundant number, since it is smaller than the sum of its proper divisors (17579118150).

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

12774777786 is a wasteful number, since it uses less digits than its factorization.

12774777786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20770 (or 20758 counting only the distinct ones).

The product of its digits is 45177216, while the sum is 63.

The spelling of 12774777786 in words is "twelve billion, seven hundred seventy-four million, seven hundred seventy-seven thousand, seven hundred eighty-six".