665212000 has 48 divisors (see below), whose sum is σ = 1634435712. Its totient is φ = 266083200.

The previous prime is 665211991. The next prime is 665212001. The reversal of 665212000 is 212566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665212001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79152 + ... + 87151.

It is an arithmetic number, because the mean of its divisors is an integer number (34050744).

Almost surely, 2^665212000 is an apocalyptic number.

It is an amenable number.

665212000 is an abundant number, since it is smaller than the sum of its proper divisors (969223712).

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

665212000 is a wasteful number, since it uses less digits than its factorization.

665212000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166328 (or 166310 counting only the distinct ones).

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

The square root of 665212000 is about 25791.7040925954. The cubic root of 665212000 is about 872.9446178478.

Adding to 665212000 its reverse (212566), we get a palindrome (665424566).

The spelling of 665212000 in words is "six hundred sixty-five million, two hundred twelve thousand".