12666534136 has 8 divisors (see below), whose sum is σ = 23749751520. Its totient is φ = 6333267064.

The previous prime is 12666534113. The next prime is 12666534143. The reversal of 12666534136 is 63143566621.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 12666534092 and 12666534101.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 791658376 + ... + 791658391.

It is an arithmetic number, because the mean of its divisors is an integer number (2968718940).

Almost surely, 2^12666534136 is an apocalyptic number.

It is an amenable number.

12666534136 is a deficient number, since it is larger than the sum of its proper divisors (11083217384).

12666534136 is a wasteful number, since it uses less digits than its factorization.

12666534136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583316773 (or 1583316769 counting only the distinct ones).

The product of its digits is 466560, while the sum is 43.

It can be divided in two parts, 126665 and 34136, that added together give a square (160801 = 401²).

The spelling of 12666534136 in words is "twelve billion, six hundred sixty-six million, five hundred thirty-four thousand, one hundred thirty-six".