665338872 has 64 divisors (see below), whose sum is σ = 1816848000. Its totient is φ = 201363840.

The previous prime is 665338859. The next prime is 665338901. The reversal of 665338872 is 278833566.

665338872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408123 + ... + 409749.

It is an arithmetic number, because the mean of its divisors is an integer number (28388250).

Almost surely, 2^665338872 is an apocalyptic number.

It is an amenable number.

665338872 is an abundant number, since it is smaller than the sum of its proper divisors (1151509128).

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

665338872 is a wasteful number, since it uses less digits than its factorization.

665338872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196 (or 3192 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 48.

The square root of 665338872 is about 25794.1635258831. The cubic root of 665338872 is about 873.0001115297. Note that the first 3 decimals are identical.

The spelling of 665338872 in words is "six hundred sixty-five million, three hundred thirty-eight thousand, eight hundred seventy-two".