12777640265 has 16 divisors (see below), whose sum is σ = 17082046800. Its totient is φ = 9110422272.

The previous prime is 12777640261. The next prime is 12777640297. The reversal of 12777640265 is 56204677721.

It can be written as a sum of positive squares in 8 ways, for example, as 30327049 + 12747313216 = 5507^2 + 112904^2 .

It is a cyclic number.

It is not a de Polignac number, because 12777640265 - 2² = 12777640261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12777640261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3387410 + ... + 3391179.

It is an arithmetic number, because the mean of its divisors is an integer number (1067627925).

Almost surely, 2^12777640265 is an apocalyptic number.

It is an amenable number.

12777640265 is a deficient number, since it is larger than the sum of its proper divisors (4304406535).

12777640265 is a wasteful number, since it uses less digits than its factorization.

12777640265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6778636.

The product of its (nonzero) digits is 987840, while the sum is 47.

The spelling of 12777640265 in words is "twelve billion, seven hundred seventy-seven million, six hundred forty thousand, two hundred sixty-five".