12558006661 has 16 divisors (see below), whose sum is σ = 13268629440. Its totient is φ = 11852455680.

The previous prime is 12558006581. The next prime is 12558006667. The reversal of 12558006661 is 16660085521.

It is a cyclic number.

It is not a de Polignac number, because 12558006661 - 2¹⁹ = 12557482373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12558006667) 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, 7784691 + ... + 7786303.

It is an arithmetic number, because the mean of its divisors is an integer number (829289340).

Almost surely, 2^12558006661 is an apocalyptic number.

It is an amenable number.

12558006661 is a deficient number, since it is larger than the sum of its proper divisors (710622779).

12558006661 is a wasteful number, since it uses less digits than its factorization.

12558006661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 12558006661 in words is "twelve billion, five hundred fifty-eight million, six thousand, six hundred sixty-one".