12530566661 has 16 divisors (see below), whose sum is σ = 13140002304. Its totient is φ = 11939148144.

The previous prime is 12530566561. The next prime is 12530566663. The reversal of 12530566661 is 16666503521.

It is a de Polignac number, because none of the positive numbers 2^k-12530566661 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12530566663) 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, 275630 + ... + 317856.

It is an arithmetic number, because the mean of its divisors is an integer number (821250144).

Almost surely, 2^12530566661 is an apocalyptic number.

It is an amenable number.

12530566661 is a deficient number, since it is larger than the sum of its proper divisors (609435643).

12530566661 is a wasteful number, since it uses less digits than its factorization.

12530566661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42440.

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 12530566661 in words is "twelve billion, five hundred thirty million, five hundred sixty-six thousand, six hundred sixty-one".