665112000 has 448 divisors, whose sum is σ = 2601870336. Its totient is φ = 146534400.

The previous prime is 665111989. The next prime is 665112017. The reversal of 665112000 is 211566.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6215947 + ... + 6216053.

Almost surely, 2^665112000 is an apocalyptic number.

665112000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665112000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1300935168).

665112000 is an abundant number, since it is smaller than the sum of its proper divisors (1936758336).

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

665112000 is a wasteful number, since it uses less digits than its factorization.

665112000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 665112000 is about 25789.7654118838. The cubic root of 665112000 is about 872.9008729783.

Adding to 665112000 its reverse (211566), we get a palindrome (665323566).

The spelling of 665112000 in words is "six hundred sixty-five million, one hundred twelve thousand".