660120216 has 64 divisors (see below), whose sum is σ = 1895923200. Its totient is φ = 187619328.

The previous prime is 660120193. The next prime is 660120233. The reversal of 660120216 is 612021066.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 22245 + ... + 42603.

It is an arithmetic number, because the mean of its divisors is an integer number (29623800).

Almost surely, 2^660120216 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 660120216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (947961600).

660120216 is an abundant number, since it is smaller than the sum of its proper divisors (1235802984).

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

660120216 is a wasteful number, since it uses less digits than its factorization.

660120216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20568 (or 20564 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 660120216 is about 25692.8047515253. The cubic root of 660120216 is about 870.7116280872.

The spelling of 660120216 in words is "six hundred sixty million, one hundred twenty thousand, two hundred sixteen".