664346723 has 16 divisors (see below), whose sum is σ = 744354720. Its totient is φ = 589234176.

The previous prime is 664346713. The next prime is 664346731. The reversal of 664346723 is 327643466.

It is a cyclic number.

It is not a de Polignac number, because 664346723 - 2¹⁸ = 664084579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664346713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57011 + ... + 67667.

It is an arithmetic number, because the mean of its divisors is an integer number (46522170).

Almost surely, 2^664346723 is an apocalyptic number.

664346723 is a deficient number, since it is larger than the sum of its proper divisors (80007997).

664346723 is a wasteful number, since it uses less digits than its factorization.

664346723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10886.

The product of its digits is 435456, while the sum is 41.

The square root of 664346723 is about 25774.9243063874. The cubic root of 664346723 is about 872.5659582925.

The spelling of 664346723 in words is "six hundred sixty-four million, three hundred forty-six thousand, seven hundred twenty-three".