664524818 has 4 divisors (see below), whose sum is σ = 996787230. Its totient is φ = 332262408.

The previous prime is 664524803. The next prime is 664524823. The reversal of 664524818 is 818425466.

It is a happy number.

664524818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 440034529 + 224490289 = 20977^2 + 14983^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166131203 + ... + 166131206.

Almost surely, 2^664524818 is an apocalyptic number.

664524818 is a deficient number, since it is larger than the sum of its proper divisors (332262412).

664524818 is a wasteful number, since it uses less digits than its factorization.

664524818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332262411.

The product of its digits is 368640, while the sum is 44.

The square root of 664524818 is about 25778.3788861907. The cubic root of 664524818 is about 872.6439224764.

The spelling of 664524818 in words is "six hundred sixty-four million, five hundred twenty-four thousand, eight hundred eighteen".