1664434323 has 24 divisors (see below), whose sum is σ = 2491117200. Its totient is φ = 1069623744.

The previous prime is 1664434279. The next prime is 1664434337. The reversal of 1664434323 is 3234344661.

1664434323 is a `hidden beast` number, since 1 + 6 + 644 + 3 + 4 + 3 + 2 + 3 = 666.

It is not a de Polignac number, because 1664434323 - 2¹² = 1664430227 is a prime.

Its product of digits (124416) is a multiple of the sum of its prime divisors (10368).

It is not an unprimeable number, because it can be changed into a prime (1664434363) 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 23 ways as a sum of consecutive naturals, for example, 167161 + ... + 176837.

It is an arithmetic number, because the mean of its divisors is an integer number (103796550).

Almost surely, 2^1664434323 is an apocalyptic number.

1664434323 is a deficient number, since it is larger than the sum of its proper divisors (826682877).

1664434323 is a wasteful number, since it uses less digits than its factorization.

1664434323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10371 (or 10368 counting only the distinct ones).

The product of its digits is 124416, while the sum is 36.

The square root of 1664434323 is about 40797.4793706670. The cubic root of 1664434323 is about 1185.1015177676.

Adding to 1664434323 its reverse (3234344661), we get a palindrome (4898778984).

The spelling of 1664434323 in words is "one billion, six hundred sixty-four million, four hundred thirty-four thousand, three hundred twenty-three".