660265313321 has 2 divisors, whose sum is σ = 660265313322. Its totient is φ = 660265313320.

The previous prime is 660265313311. The next prime is 660265313333. The reversal of 660265313321 is 123313562066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 571892887696 + 88372425625 = 756236^2 + 297275^2 .

It is a cyclic number.

It is not a de Polignac number, because 660265313321 - 2¹⁰ = 660265312297 is a prime.

It is not a weakly prime, because it can be changed into another prime (660265313311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330132656660 + 330132656661.

It is an arithmetic number, because the mean of its divisors is an integer number (330132656661).

Almost surely, 2^660265313321 is an apocalyptic number.

It is an amenable number.

660265313321 is a deficient number, since it is larger than the sum of its proper divisors (1).

660265313321 is an equidigital number, since it uses as much as digits as its factorization.

660265313321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 38.

Adding to 660265313321 its reverse (123313562066), we get a palindrome (783578875387).

The spelling of 660265313321 in words is "six hundred sixty billion, two hundred sixty-five million, three hundred thirteen thousand, three hundred twenty-one".