664043522 has 4 divisors (see below), whose sum is σ = 996065286.
Its totient is φ = 332021760.
The previous prime is 664043459. The next prime is 664043531. The reversal of 664043522 is 225340466.
Adding to 664043522 its reverse (225340466), we get a palindrome (889383988).
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., 340439401 + 323604121 = 18451^2 + 17989^2
It is a super-2 number, since 2×6640435222 = 881907598220328968, which contains 22 as substring.
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166010879 + ... + 166010882.
Almost surely, 2664043522 is an apocalyptic number.
664043522 is a deficient number, since it is larger than the sum of its proper divisors (332021764).
664043522 is a wasteful number, since it uses less digits than its factorization.
664043522 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 332021763.
The product of its (nonzero) digits is 34560, while the sum is 32.
The square root of 664043522 is about 25769.0419301921.
The cubic root of 664043522 is about 872.4331947219.
The spelling of 664043522 in words is "six hundred sixty-four million, forty-three thousand, five hundred twenty-two".