665412012 has 18 divisors (see below), whose sum is σ = 1682013788. Its totient is φ = 221803992.

The previous prime is 665411983. The next prime is 665412017. The reversal of 665412012 is 210214566.

665412012 is a `hidden beast` number, since 6 + 654 + 1 + 2 + 0 + 1 + 2 = 666.

665412012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (665412017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9241798 + ... + 9241869.

Almost surely, 2^665412012 is an apocalyptic number.

It is an amenable number.

665412012 is an abundant number, since it is smaller than the sum of its proper divisors (1016601776).

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

665412012 is a wasteful number, since it uses less digits than its factorization.

665412012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18483677 (or 18483672 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 665412012 is about 25795.5812495086. The cubic root of 665412012 is about 873.0320996845.

Adding to 665412012 its reverse (210214566), we get a palindrome (875626578).

The spelling of 665412012 in words is "six hundred sixty-five million, four hundred twelve thousand, twelve".