12777555717 has 12 divisors (see below), whose sum is σ = 18635659744. Its totient is φ = 8435667240.

The previous prime is 12777555709. The next prime is 12777555757. The reversal of 12777555717 is 71755577721.

It is a happy number.

12777555717 is a `hidden beast` number, since 1 + 2 + 7 + 7 + 75 + 557 + 17 = 666.

It is not a de Polignac number, because 12777555717 - 2³ = 12777555709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12777555757) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6890959 + ... + 6892812.

Almost surely, 2^12777555717 is an apocalyptic number.

It is an amenable number.

12777555717 is a deficient number, since it is larger than the sum of its proper divisors (5858104027).

12777555717 is a wasteful number, since it uses less digits than its factorization.

12777555717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13783880 (or 13783877 counting only the distinct ones).

The product of its digits is 4201750, while the sum is 54.

The spelling of 12777555717 in words is "twelve billion, seven hundred seventy-seven million, five hundred fifty-five thousand, seven hundred seventeen".