664245612 has 72 divisors (see below), whose sum is σ = 1776902400. Its totient is φ = 208787040.

The previous prime is 664245583. The next prime is 664245619. The reversal of 664245612 is 216542466.

664245612 is a `hidden beast` number, since 6 + 642 + 4 + 5 + 6 + 1 + 2 = 666.

It is a super-3 number, since 3×664245612³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (664245619) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 53139 + ... + 64437.

It is an arithmetic number, because the mean of its divisors is an integer number (24679200).

Almost surely, 2^664245612 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664245612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (888451200).

664245612 is an abundant number, since it is smaller than the sum of its proper divisors (1112656788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664245612 is a wasteful number, since it uses less digits than its factorization.

664245612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11403 (or 11398 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 664245612 is about 25772.9628098905. The cubic root of 664245612 is about 872.5216889927.

The spelling of 664245612 in words is "six hundred sixty-four million, two hundred forty-five thousand, six hundred twelve".