12666382061 has 4 divisors (see below), whose sum is σ = 12675986400. Its totient is φ = 12656777724.

The previous prime is 12666382021. The next prime is 12666382067. The reversal of 12666382061 is 16028366621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12666382061 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666382067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4800191 + ... + 4802828.

It is an arithmetic number, because the mean of its divisors is an integer number (3168996600).

Almost surely, 2^12666382061 is an apocalyptic number.

It is an amenable number.

12666382061 is a deficient number, since it is larger than the sum of its proper divisors (9604339).

12666382061 is an equidigital number, since it uses as much as digits as its factorization.

12666382061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9604338.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 12666382061 in words is "twelve billion, six hundred sixty-six million, three hundred eighty-two thousand, sixty-one".