660605272813 has 2 divisors, whose sum is σ = 660605272814. Its totient is φ = 660605272812.

The previous prime is 660605272759. The next prime is 660605272853. The reversal of 660605272813 is 318272506066.

660605272813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 528467933764 + 132137339049 = 726958^2 + 363507^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660605272813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660605272853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330302636406 + 330302636407.

It is an arithmetic number, because the mean of its divisors is an integer number (330302636407).

Almost surely, 2^660605272813 is an apocalyptic number.

It is an amenable number.

660605272813 is a deficient number, since it is larger than the sum of its proper divisors (1).

660605272813 is an equidigital number, since it uses as much as digits as its factorization.

660605272813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 46.

Adding to 660605272813 its reverse (318272506066), we get a palindrome (978877778879).

The spelling of 660605272813 in words is "six hundred sixty billion, six hundred five million, two hundred seventy-two thousand, eight hundred thirteen".