665173912 has 16 divisors (see below), whose sum is σ = 1343139840. Its totient is φ = 307003296.

The previous prime is 665173877. The next prime is 665173919. The reversal of 665173912 is 219371566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665173919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3197848 + ... + 3198055.

It is an arithmetic number, because the mean of its divisors is an integer number (83946240).

Almost surely, 2^665173912 is an apocalyptic number.

It is an amenable number.

665173912 is an abundant number, since it is smaller than the sum of its proper divisors (677965928).

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

665173912 is a wasteful number, since it uses less digits than its factorization.

665173912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6395922 (or 6395918 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The square root of 665173912 is about 25790.9657050681. The cubic root of 665173912 is about 872.9279568189.

The spelling of 665173912 in words is "six hundred sixty-five million, one hundred seventy-three thousand, nine hundred twelve".