664732172288 has 66 divisors (see below), whose sum is σ = 1331829614499. Its totient is φ = 331775737856.

The previous prime is 664732172281. The next prime is 664732172297. The reversal of 664732172288 is 882271237466.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 332366086144 + 332366086144 = 576512^2 + 576512^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=576512.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664732172281) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1180696295 + ... + 1180696857.

Almost surely, 2^664732172288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664732172288

664732172288 is an abundant number, since it is smaller than the sum of its proper divisors (667097442211).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664732172288 is an frugal number, since it uses more digits than its factorization.

664732172288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168 (or 565 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 56.

The spelling of 664732172288 in words is "six hundred sixty-four billion, seven hundred thirty-two million, one hundred seventy-two thousand, two hundred eighty-eight".