12512161566 has 24 divisors (see below), whose sum is σ = 27114876360. Its totient is φ = 4169921616.

The previous prime is 12512161559. The next prime is 12512161577. The reversal of 12512161566 is 66516121521.

12512161566 is a `hidden beast` number, since 1 + 25 + 12 + 1 + 61 + 566 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12512161566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34120 + ... + 161828.

It is an arithmetic number, because the mean of its divisors is an integer number (1129786515).

Almost surely, 2^12512161566 is an apocalyptic number.

12512161566 is an abundant number, since it is smaller than the sum of its proper divisors (14602714794).

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

12512161566 is a wasteful number, since it uses less digits than its factorization.

12512161566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133160 (or 133157 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The spelling of 12512161566 in words is "twelve billion, five hundred twelve million, one hundred sixty-one thousand, five hundred sixty-six".