664423121 has 8 divisors (see below), whose sum is σ = 714008160. Its totient is φ = 616004928.

The previous prime is 664423117. The next prime is 664423129. The reversal of 664423121 is 121324466.

664423121 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 664423121 - 2² = 664423117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664423129) 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, 290531 + ... + 292808.

It is an arithmetic number, because the mean of its divisors is an integer number (89251020).

Almost surely, 2^664423121 is an apocalyptic number.

It is an amenable number.

664423121 is a deficient number, since it is larger than the sum of its proper divisors (49585039).

664423121 is a wasteful number, since it uses less digits than its factorization.

664423121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583423.

The product of its digits is 6912, while the sum is 29.

The square root of 664423121 is about 25776.4062855938. The cubic root of 664423121 is about 872.5994045521.

Adding to 664423121 its reverse (121324466), we get a palindrome (785747587).

The spelling of 664423121 in words is "six hundred sixty-four million, four hundred twenty-three thousand, one hundred twenty-one".