665140000 has 120 divisors (see below), whose sum is σ = 1870501248. Its totient is φ = 228000000.

The previous prime is 665139991. The next prime is 665140031. The reversal of 665140000 is 41566.

It is a super-2 number, since 2×665140000² = 884822439200000000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 137625 + ... + 142375.

Almost surely, 2^665140000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665140000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (935250624).

665140000 is an abundant number, since it is smaller than the sum of its proper divisors (1205361248).

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

665140000 is an equidigital number, since it uses as much as digits as its factorization.

665140000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4788 (or 4765 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 665140000 is about 25790.3082571729. The cubic root of 665140000 is about 872.9131219837.

Adding to 665140000 its reverse (41566), we get a palindrome (665181566).

The spelling of 665140000 in words is "six hundred sixty-five million, one hundred forty thousand".