665509080 has 32 divisors (see below), whose sum is σ = 1996527600. Its totient is φ = 177469056.

The previous prime is 665509073. The next prime is 665509111. The reversal of 665509080 is 80905566.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 2772835 + ... + 2773074.

Almost surely, 2^665509080 is an apocalyptic number.

665509080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665509080 is an abundant number, since it is smaller than the sum of its proper divisors (1331018520).

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

665509080 is a wasteful number, since it uses less digits than its factorization.

665509080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5545923 (or 5545919 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 665509080 is about 25797.4626659290. The cubic root of 665509080 is about 873.0745492536.

The spelling of 665509080 in words is "six hundred sixty-five million, five hundred nine thousand, eighty".