665344920 has 64 divisors (see below), whose sum is σ = 2082827520. Its totient is φ = 169710464.

The previous prime is 665344913. The next prime is 665344921. The reversal of 665344920 is 29443566.

665344920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665344921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117774 + ... + 123293.

It is an arithmetic number, because the mean of its divisors is an integer number (32544180).

Almost surely, 2^665344920 is an apocalyptic number.

665344920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665344920 is an abundant number, since it is smaller than the sum of its proper divisors (1417482600).

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

665344920 is a wasteful number, since it uses less digits than its factorization.

665344920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241104 (or 241100 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 665344920 is about 25794.2807614401. The cubic root of 665344920 is about 873.0027567424.

The spelling of 665344920 in words is "six hundred sixty-five million, three hundred forty-four thousand, nine hundred twenty".