664045456 has 20 divisors (see below), whose sum is σ = 1287865612. Its totient is φ = 331693056.

The previous prime is 664045453. The next prime is 664045477. The reversal of 664045456 is 654540466.

It can be written as a sum of positive squares in 2 ways, for example, as 634233856 + 29811600 = 25184^2 + 5460^2 .

It is not an unprimeable number, because it can be changed into a prime (664045453) 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 3 ways as a sum of consecutive naturals, for example, 3561 + ... + 36616.

Almost surely, 2^664045456 is an apocalyptic number.

It is an amenable number.

664045456 is a deficient number, since it is larger than the sum of its proper divisors (623820156).

664045456 is a wasteful number, since it uses less digits than its factorization.

664045456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41218 (or 41212 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

The square root of 664045456 is about 25769.0794558129. The cubic root of 664045456 is about 872.4340416966.

The spelling of 664045456 in words is "six hundred sixty-four million, forty-five thousand, four hundred fifty-six".