660204216 has 128 divisors (see below), whose sum is σ = 2105280000. Its totient is φ = 187785216.

The previous prime is 660204151. The next prime is 660204217. The reversal of 660204216 is 612402066.

It is a happy number.

660204216 is a `hidden beast` number, since 6 + 602 + 0 + 42 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 660204216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660204217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 387735 + ... + 389433.

It is an arithmetic number, because the mean of its divisors is an integer number (16447500).

Almost surely, 2^660204216 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 660204216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1052640000).

660204216 is an abundant number, since it is smaller than the sum of its proper divisors (1445075784).

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

660204216 is a wasteful number, since it uses less digits than its factorization.

660204216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978 (or 1968 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 660204216 is about 25694.4393984379. The cubic root of 660204216 is about 870.7485590749.

The spelling of 660204216 in words is "six hundred sixty million, two hundred four thousand, two hundred sixteen".