664147323 has 24 divisors (see below), whose sum is σ = 1144564560. Its totient is φ = 379512000.

The previous prime is 664147291. The next prime is 664147327. The reversal of 664147323 is 323741466.

It is a happy number.

664147323 is a `hidden beast` number, since 6 + 641 + 4 + 7 + 3 + 2 + 3 = 666.

It is not a de Polignac number, because 664147323 - 2⁵ = 664147291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664147327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 249678 + ... + 252323.

It is an arithmetic number, because the mean of its divisors is an integer number (47690190).

Almost surely, 2^664147323 is an apocalyptic number.

664147323 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

664147323 is a deficient number, since it is larger than the sum of its proper divisors (480417237).

664147323 is a wasteful number, since it uses less digits than its factorization.

664147323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502024 (or 502011 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 664147323 is about 25771.0559155033. The cubic root of 664147323 is about 872.4786509392.

Adding to 664147323 its reverse (323741466), we get a palindrome (987888789).

It can be divided in two parts, 66414 and 7323, that added together give a palindrome (73737).

The spelling of 664147323 in words is "six hundred sixty-four million, one hundred forty-seven thousand, three hundred twenty-three".