665583612 has 12 divisors (see below), whose sum is σ = 1553028456. Its totient is φ = 221861200.

The previous prime is 665583599. The next prime is 665583617. The reversal of 665583612 is 216385566.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665583617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27732639 + ... + 27732662.

It is an arithmetic number, because the mean of its divisors is an integer number (129419038).

Almost surely, 2^665583612 is an apocalyptic number.

It is an amenable number.

665583612 is an abundant number, since it is smaller than the sum of its proper divisors (887444844).

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

665583612 is a wasteful number, since it uses less digits than its factorization.

665583612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55465308 (or 55465306 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The square root of 665583612 is about 25798.9071861581. The cubic root of 665583612 is about 873.1071406262.

The spelling of 665583612 in words is "six hundred sixty-five million, five hundred eighty-three thousand, six hundred twelve".