12618133561 has 16 divisors (see below), whose sum is σ = 13976668800. Its totient is φ = 11295244800.

The previous prime is 12618133531. The next prime is 12618133571. The reversal of 12618133561 is 16533181621.

It is a cyclic number.

It is not a de Polignac number, because 12618133561 - 2⁷ = 12618133433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12618133561.

It is not an unprimeable number, because it can be changed into a prime (12618133501) 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, 637705 + ... + 657193.

It is an arithmetic number, because the mean of its divisors is an integer number (873541800).

Almost surely, 2^12618133561 is an apocalyptic number.

12618133561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12618133561 is a deficient number, since it is larger than the sum of its proper divisors (1358535239).

12618133561 is a wasteful number, since it uses less digits than its factorization.

12618133561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20400.

The product of its digits is 25920, while the sum is 37.

The spelling of 12618133561 in words is "twelve billion, six hundred eighteen million, one hundred thirty-three thousand, five hundred sixty-one".