664845182272 has 28 divisors (see below), whose sum is σ = 1347372423360. Its totient is φ = 325349768576.

The previous prime is 664845182269. The next prime is 664845182291. The reversal of 664845182272 is 272281548466.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110509822 + ... + 110515837.

Almost surely, 2^664845182272 is an apocalyptic number.

It is an amenable number.

664845182272 is an abundant number, since it is smaller than the sum of its proper divisors (682527241088).

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

664845182272 is a wasteful number, since it uses less digits than its factorization.

664845182272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221025718 (or 221025708 counting only the distinct ones).

The product of its digits is 10321920, while the sum is 55.

The spelling of 664845182272 in words is "six hundred sixty-four billion, eight hundred forty-five million, one hundred eighty-two thousand, two hundred seventy-two".