12566628197 has 32 divisors (see below), whose sum is σ = 13586227200. Its totient is φ = 11596920192.

The previous prime is 12566628167. The next prime is 12566628199. The reversal of 12566628197 is 79182666521.

It is a cyclic number.

It is not a de Polignac number, because 12566628197 - 2²⁴ = 12549850981 is a prime.

It is a Smith number, since the sum of its digits (53) 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 (12566628199) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15533129 + ... + 15533937.

It is an arithmetic number, because the mean of its divisors is an integer number (424569600).

Almost surely, 2^12566628197 is an apocalyptic number.

It is an amenable number.

12566628197 is a deficient number, since it is larger than the sum of its proper divisors (1019599003).

12566628197 is a wasteful number, since it uses less digits than its factorization.

12566628197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097.

The product of its digits is 2177280, while the sum is 53.

The spelling of 12566628197 in words is "twelve billion, five hundred sixty-six million, six hundred twenty-eight thousand, one hundred ninety-seven".