664444342532 has 6 divisors (see below), whose sum is σ = 1162777599438. Its totient is φ = 332222171264.

The previous prime is 664444342483. The next prime is 664444342543. The reversal of 664444342532 is 235243444466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 646052643076 + 18391699456 = 803774^2 + 135616^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 83055542813 + ... + 83055542820.

It is an arithmetic number, because the mean of its divisors is an integer number (193796266573).

Almost surely, 2^664444342532 is an apocalyptic number.

It is an amenable number.

664444342532 is a deficient number, since it is larger than the sum of its proper divisors (498333256906).

664444342532 is a wasteful number, since it uses less digits than its factorization.

664444342532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166111085637 (or 166111085635 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 47.

Adding to 664444342532 its reverse (235243444466), we get a palindrome (899687786998).

The spelling of 664444342532 in words is "six hundred sixty-four billion, four hundred forty-four million, three hundred forty-two thousand, five hundred thirty-two".