660868185041 has 2 divisors, whose sum is σ = 660868185042. Its totient is φ = 660868185040.

The previous prime is 660868184993. The next prime is 660868185113. The reversal of 660868185041 is 140581868066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 650893968400 + 9974216641 = 806780^2 + 99871^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660868185041 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (660868187041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330434092520 + 330434092521.

It is an arithmetic number, because the mean of its divisors is an integer number (330434092521).

Almost surely, 2^660868185041 is an apocalyptic number.

It is an amenable number.

660868185041 is a deficient number, since it is larger than the sum of its proper divisors (1).

660868185041 is an equidigital number, since it uses as much as digits as its factorization.

660868185041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2211840, while the sum is 53.

The spelling of 660868185041 in words is "six hundred sixty billion, eight hundred sixty-eight million, one hundred eighty-five thousand, forty-one".