12818377665 has 12 divisors (see below), whose sum is σ = 22218521364. Its totient is φ = 6836468064.

The previous prime is 12818377651. The next prime is 12818377681. The reversal of 12818377665 is 56677381821.

It is a happy number.

12818377665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 9213696144 + 3604681521 = 95988^2 + 60039^2 .

It is not a de Polignac number, because 12818377665 - 2⁶ = 12818377601 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142426374 + ... + 142426463.

It is an arithmetic number, because the mean of its divisors is an integer number (1851543447).

Almost surely, 2^12818377665 is an apocalyptic number.

12818377665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12818377665 is a deficient number, since it is larger than the sum of its proper divisors (9400143699).

12818377665 is a wasteful number, since it uses less digits than its factorization.

12818377665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284852848 (or 284852845 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 12818377665 in words is "twelve billion, eight hundred eighteen million, three hundred seventy-seven thousand, six hundred sixty-five".