12661341660 has 120 divisors (see below), whose sum is σ = 43329985776. Its totient is φ = 3069411840.

The previous prime is 12661341647. The next prime is 12661341661. The reversal of 12661341660 is 6614316621.

It is a happy number.

12661341660 is a `hidden beast` number, since 1 + 26 + 613 + 4 + 16 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661341661) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 337437 + ... + 373076.

Almost surely, 2^12661341660 is an apocalyptic number.

12661341660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12661341660 is an abundant number, since it is smaller than the sum of its proper divisors (30668644116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12661341660 is a wasteful number, since it uses less digits than its factorization.

12661341660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710545 (or 710534 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 12661341660 in words is "twelve billion, six hundred sixty-one million, three hundred forty-one thousand, six hundred sixty".