12663571 has 4 divisors (see below), whose sum is σ = 12775752. Its totient is φ = 12551392.

The previous prime is 12663569. The next prime is 12663577. The reversal of 12663571 is 17536621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12663571 - 2¹ = 12663569 is a prime.

It is a super-5 number, since 5×12663571⁵ (a number of 37 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12663577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55921 + ... + 56146.

It is an arithmetic number, because the mean of its divisors is an integer number (3193938).

Almost surely, 2^12663571 is an apocalyptic number.

12663571 is a deficient number, since it is larger than the sum of its proper divisors (112181).

12663571 is a wasteful number, since it uses less digits than its factorization.

12663571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112180.

The product of its digits is 7560, while the sum is 31.

The square root of 12663571 is about 3558.5911538135. The cubic root of 12663571 is about 233.0873637034.

The spelling of 12663571 in words is "twelve million, six hundred sixty-three thousand, five hundred seventy-one".