660551224566500 has 48 divisors (see below), whose sum is σ = 1446924717179760. Its totient is φ = 263436452697600.

The previous prime is 660551224566461. The next prime is 660551224566503. The reversal of 660551224566500 is 5665422155066.

It can be written as a sum of positive squares in 8 ways, for example, as 132045700960996 + 528505523605504 = 11491114^2 + 22989248^2 .

It is a super-3 number, since 3×660551224566500³ (a number of 45 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (660551224566503) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1959924155 + ... + 1960261154.

It is an arithmetic number, because the mean of its divisors is an integer number (30144264941245).

Almost surely, 2^{660551224566500} is an apocalyptic number.

It is an amenable number.

660551224566500 is an abundant number, since it is smaller than the sum of its proper divisors (786373492613260).

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

660551224566500 is a wasteful number, since it uses less digits than its factorization.

660551224566500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3920185665 (or 3920185653 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 53.

The spelling of 660551224566500 in words is "six hundred sixty trillion, five hundred fifty-one billion, two hundred twenty-four million, five hundred sixty-six thousand, five hundred".