664224819 has 8 divisors (see below), whose sum is σ = 932245440. Its totient is φ = 419510376.

The previous prime is 664224793. The next prime is 664224829. The reversal of 664224819 is 918422466.

664224819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664224819 - 2⁹ = 664224307 is a prime.

It is a super-2 number, since 2×664224819² = 882389220351165522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (664224829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5826477 + ... + 5826590.

It is an arithmetic number, because the mean of its divisors is an integer number (116530680).

Almost surely, 2^664224819 is an apocalyptic number.

664224819 is a deficient number, since it is larger than the sum of its proper divisors (268020621).

664224819 is a wasteful number, since it uses less digits than its factorization.

664224819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11653089.

The product of its digits is 165888, while the sum is 42.

The square root of 664224819 is about 25772.5594188858. The cubic root of 664224819 is about 872.5125846632.

The spelling of 664224819 in words is "six hundred sixty-four million, two hundred twenty-four thousand, eight hundred nineteen".