665949224 has 32 divisors (see below), whose sum is σ = 1281185640. Its totient is φ = 324326400.

The previous prime is 665949217. The next prime is 665949227. The reversal of 665949224 is 422949566.

It can be written as a sum of positive squares in 4 ways, for example, as 412821124 + 253128100 = 20318^2 + 15910^2 .

It is not an unprimeable number, because it can be changed into a prime (665949227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268052 + ... + 270524.

Almost surely, 2^665949224 is an apocalyptic number.

It is an amenable number.

665949224 is a deficient number, since it is larger than the sum of its proper divisors (615236416).

665949224 is a wasteful number, since it uses less digits than its factorization.

665949224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3341 (or 3337 counting only the distinct ones).

The product of its digits is 933120, while the sum is 47.

The square root of 665949224 is about 25805.9920173591. The cubic root of 665949224 is about 873.2669803068.

The spelling of 665949224 in words is "six hundred sixty-five million, nine hundred forty-nine thousand, two hundred twenty-four".