12664435563 has 64 divisors (see below), whose sum is σ = 20635130880. Its totient is φ = 7629479424.

The previous prime is 12664435529. The next prime is 12664435571. The reversal of 12664435563 is 36553446621.

12664435563 is a `hidden beast` number, since 1 + 26 + 64 + 4 + 3 + 5 + 563 = 666.

It is not a de Polignac number, because 12664435563 - 2⁸ = 12664435307 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (12664435523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3290106 + ... + 3293952.

It is an arithmetic number, because the mean of its divisors is an integer number (322423920).

Almost surely, 2^12664435563 is an apocalyptic number.

12664435563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12664435563 is a deficient number, since it is larger than the sum of its proper divisors (7970695317).

12664435563 is a wasteful number, since it uses less digits than its factorization.

12664435563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4065 (or 4059 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 45.

The spelling of 12664435563 in words is "twelve billion, six hundred sixty-four million, four hundred thirty-five thousand, five hundred sixty-three".