666225563 has 4 divisors (see below), whose sum is σ = 705415320. Its totient is φ = 627035808.

The previous prime is 666225559. The next prime is 666225583. The reversal of 666225563 is 365522666.

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 666225563 - 2² = 666225559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666225563.

It is not an unprimeable number, because it can be changed into a prime (666225583) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 19594853 + ... + 19594886.

It is an arithmetic number, because the mean of its divisors is an integer number (176353830).

Almost surely, 2^666225563 is an apocalyptic number.

666225563 is a deficient number, since it is larger than the sum of its proper divisors (39189757).

666225563 is a wasteful number, since it uses less digits than its factorization.

666225563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39189756.

The product of its digits is 388800, while the sum is 41.

The square root of 666225563 is about 25811.3456255190. The cubic root of 666225563 is about 873.3877524539.

The spelling of 666225563 in words is "six hundred sixty-six million, two hundred twenty-five thousand, five hundred sixty-three".