660215600 has 120 divisors (see below), whose sum is σ = 1742023920. Its totient is φ = 238464000.

The previous prime is 660215597. The next prime is 660215609. The reversal of 660215600 is 6512066.

It is a super-3 number, since 3×660215600³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 660215600.

It is not an unprimeable number, because it can be changed into a prime (660215609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 795986 + ... + 796814.

It is an arithmetic number, because the mean of its divisors is an integer number (14516866).

Almost surely, 2^660215600 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 660215600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (871011960).

660215600 is an abundant number, since it is smaller than the sum of its proper divisors (1081808320).

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

660215600 is a wasteful number, since it uses less digits than its factorization.

660215600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039 (or 1028 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 660215600 is about 25694.6609240130. The cubic root of 660215600 is about 870.7535638620.

Adding to 660215600 its reverse (6512066), we get a palindrome (666727666).

The spelling of 660215600 in words is "six hundred sixty million, two hundred fifteen thousand, six hundred".