12665609582426 has 64 divisors (see below), whose sum is σ = 21220881776640. Its totient is φ = 5643849960000.

The previous prime is 12665609582399. The next prime is 12665609582543. The reversal of 12665609582426 is 62428590656621.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47419151 + ... + 47685501.

It is an arithmetic number, because the mean of its divisors is an integer number (331576277760).

Almost surely, 2^{12665609582426} is an apocalyptic number.

12665609582426 is a deficient number, since it is larger than the sum of its proper divisors (8555272194214).

12665609582426 is a wasteful number, since it uses less digits than its factorization.

12665609582426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267531.

The product of its (nonzero) digits is 74649600, while the sum is 62.

The spelling of 12665609582426 in words is "twelve trillion, six hundred sixty-five billion, six hundred nine million, five hundred eighty-two thousand, four hundred twenty-six".