664986612 has 24 divisors (see below), whose sum is σ = 1552283712.
Its totient is φ = 221569600.
The previous prime is 664986587. The next prime is 664986631. The reversal of 664986612 is 216689466.
It is a happy number.
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 in 7 ways as a sum of consecutive naturals, for example, 22312 + ... + 42752.
It is an arithmetic number, because the mean of its divisors is an integer number (64678488).
Almost surely, 2664986612 is an apocalyptic number.
It is an amenable number.
664986612 is an abundant number, since it is smaller than the sum of its proper divisors (887297100).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
664986612 is a wasteful number, since it uses less digits than its factorization.
664986612 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 23159 (or 23157 counting only the distinct ones).
The product of its digits is 746496, while the sum is 48.
The square root of 664986612 is about 25787.3343329628.
The cubic root of 664986612 is about 872.8460159651.
The spelling of 664986612 in words is "six hundred sixty-four million, nine hundred eighty-six thousand, six hundred twelve".