666225446 has 4 divisors (see below), whose sum is σ = 999338172. Its totient is φ = 333112722.

The previous prime is 666225403. The next prime is 666225467. The reversal of 666225446 is 644522666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166556360 + ... + 166556363.

It is an arithmetic number, because the mean of its divisors is an integer number (249834543).

Almost surely, 2^666225446 is an apocalyptic number.

666225446 is a deficient number, since it is larger than the sum of its proper divisors (333112726).

666225446 is a wasteful number, since it uses less digits than its factorization.

666225446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333112725.

The product of its digits is 414720, while the sum is 41.

The square root of 666225446 is about 25811.3433590737. The cubic root of 666225446 is about 873.3877013269.

The spelling of 666225446 in words is "six hundred sixty-six million, two hundred twenty-five thousand, four hundred forty-six".