12611336661 has 128 divisors (see below), whose sum is σ = 24783667200. Its totient is φ = 6136058880.

The previous prime is 12611336599. The next prime is 12611336687. The reversal of 12611336661 is 16663311621.

It is not a de Polignac number, because 12611336661 - 2⁶ = 12611336597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12611336261) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8446231 + ... + 8447723.

It is an arithmetic number, because the mean of its divisors is an integer number (193622400).

Almost surely, 2^12611336661 is an apocalyptic number.

12611336661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12611336661 is a deficient number, since it is larger than the sum of its proper divisors (12172330539).

12611336661 is a wasteful number, since it uses less digits than its factorization.

12611336661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776 (or 1770 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The spelling of 12611336661 in words is "twelve billion, six hundred eleven million, three hundred thirty-six thousand, six hundred sixty-one".