660363280128 has 360 divisors, whose sum is σ = 2077892586000. Its totient is φ = 208015589376.

The previous prime is 660363280079. The next prime is 660363280237. The reversal of 660363280128 is 821082363066.

It is a happy number.

660363280128 is a `hidden beast` number, since 6 + 6 + 0 + 3 + 632 + 8 + 0 + 1 + 2 + 8 = 666.

660363280128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×660363280128² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 176896950 + ... + 176900682.

It is an arithmetic number, because the mean of its divisors is an integer number (5771923850).

Almost surely, 2^660363280128 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 660363280128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1038946293000).

660363280128 is an abundant number, since it is smaller than the sum of its proper divisors (1417529305872).

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

660363280128 is a wasteful number, since it uses less digits than its factorization.

660363280128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4229 (or 4206 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 660363280128 in words is "six hundred sixty billion, three hundred sixty-three million, two hundred eighty thousand, one hundred twenty-eight".