666122560 has 56 divisors (see below), whose sum is σ = 1679524200. Its totient is φ = 250773504.

The previous prime is 666122551. The next prime is 666122563. The reversal of 666122560 is 65221666.

666122560 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 17707264 + 648415296 = 4208^2 + 25464^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666122563) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 55785 + ... + 66664.

Almost surely, 2^666122560 is an apocalyptic number.

It is an amenable number.

666122560 is an abundant number, since it is smaller than the sum of its proper divisors (1013401640).

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

666122560 is a wasteful number, since it uses less digits than its factorization.

666122560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122483 (or 122473 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 666122560 is about 25809.3502436617. The cubic root of 666122560 is about 873.3427395733.

The spelling of 666122560 in words is "six hundred sixty-six million, one hundred twenty-two thousand, five hundred sixty".