660212985600 has 2160 divisors, whose sum is σ = 2944144896000. Its totient is φ = 145825505280.

The previous prime is 660212985599. The next prime is 660212985613. The reversal of 660212985600 is 6589212066.

660212985600 is a `hidden beast` number, since 6 + 60 + 2 + 1 + 29 + 8 + 560 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2160).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 8357126361 + ... + 8357126439.

Almost surely, 2^660212985600 is an apocalyptic number.

660212985600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660212985600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1472072448000).

660212985600 is an abundant number, since it is smaller than the sum of its proper divisors (2283931910400).

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

660212985600 is an equidigital number, since it uses as much as digits as its factorization.

660212985600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 660212985600 in words is "six hundred sixty billion, two hundred twelve million, nine hundred eighty-five thousand, six hundred".