12477777777 has 6 divisors (see below), whose sum is σ = 18023456802. Its totient is φ = 8318518512.

The previous prime is 12477777761. The next prime is 12477777811. The reversal of 12477777777 is 77777777421.

It can be written as a sum of positive squares in only one way, i.e., 12433142016 + 44635761 = 111504^2 + 6681^2 .

It is not a de Polignac number, because 12477777777 - 2⁴ = 12477777761 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (12477777077) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 693209868 + ... + 693209885.

It is an arithmetic number, because the mean of its divisors is an integer number (3003909467).

Almost surely, 2^12477777777 is an apocalyptic number.

It is an amenable number.

12477777777 is a deficient number, since it is larger than the sum of its proper divisors (5545679025).

12477777777 is a wasteful number, since it uses less digits than its factorization.

12477777777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386419759 (or 1386419756 counting only the distinct ones).

The product of its digits is 46118408, while the sum is 63.

The spelling of 12477777777 in words is "twelve billion, four hundred seventy-seven million, seven hundred seventy-seven thousand, seven hundred seventy-seven".