664416572 has 12 divisors (see below), whose sum is σ = 1171217040. Its totient is φ = 329783136.

The previous prime is 664416551. The next prime is 664416647. The reversal of 664416572 is 275614466.

It is a happy number.

664416572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×664416572² = 882898762296462368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 605672 + ... + 606767.

It is an arithmetic number, because the mean of its divisors is an integer number (97601420).

Almost surely, 2^664416572 is an apocalyptic number.

It is an amenable number.

664416572 is a deficient number, since it is larger than the sum of its proper divisors (506800468).

664416572 is a wasteful number, since it uses less digits than its factorization.

664416572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212580 (or 1212578 counting only the distinct ones).

The product of its digits is 241920, while the sum is 41.

The square root of 664416572 is about 25776.2792505047. The cubic root of 664416572 is about 872.5965375677.

The spelling of 664416572 in words is "six hundred sixty-four million, four hundred sixteen thousand, five hundred seventy-two".