12766665745 has 16 divisors (see below), whose sum is σ = 15421536000. Its totient is φ = 10145760768.

The previous prime is 12766665739. The next prime is 12766665823. The reversal of 12766665745 is 54756666721.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12766665745 - 2²⁹ = 12229794833 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 923041 + ... + 936769.

It is an arithmetic number, because the mean of its divisors is an integer number (963846000).

Almost surely, 2^12766665745 is an apocalyptic number.

It is an amenable number.

12766665745 is a deficient number, since it is larger than the sum of its proper divisors (2654870255).

12766665745 is a wasteful number, since it uses less digits than its factorization.

12766665745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14952.

The product of its digits is 12700800, while the sum is 55.

The spelling of 12766665745 in words is "twelve billion, seven hundred sixty-six million, six hundred sixty-five thousand, seven hundred forty-five".