12774777785 has 16 divisors (see below), whose sum is σ = 19112395392. Its totient is φ = 7963497600.

The previous prime is 12774777749. The next prime is 12774777793. The reversal of 12774777785 is 58777747721.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-12774777785 is a prime.

It is a super-2 number, since 2×12774777785² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16590236 + ... + 16591005.

It is an arithmetic number, because the mean of its divisors is an integer number (1194524712).

Almost surely, 2^12774777785 is an apocalyptic number.

It is an amenable number.

12774777785 is a deficient number, since it is larger than the sum of its proper divisors (6337617607).

12774777785 is a wasteful number, since it uses less digits than its factorization.

12774777785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33181264.

The product of its digits is 37647680, while the sum is 62.

The spelling of 12774777785 in words is "twelve billion, seven hundred seventy-four million, seven hundred seventy-seven thousand, seven hundred eighty-five".