660849745177 has 2 divisors, whose sum is σ = 660849745178. Its totient is φ = 660849745176.

The previous prime is 660849745141. The next prime is 660849745189. The reversal of 660849745177 is 771547948066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 655329106576 + 5520638601 = 809524^2 + 74301^2 .

It is a cyclic number.

It is not a de Polignac number, because 660849745177 - 2¹¹ = 660849743129 is a prime.

It is a super-2 number, since 2×660849745177² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (660849775177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330424872588 + 330424872589.

It is an arithmetic number, because the mean of its divisors is an integer number (330424872589).

Almost surely, 2^660849745177 is an apocalyptic number.

It is an amenable number.

660849745177 is a deficient number, since it is larger than the sum of its proper divisors (1).

660849745177 is an equidigital number, since it uses as much as digits as its factorization.

660849745177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71124480, while the sum is 64.

The spelling of 660849745177 in words is "six hundred sixty billion, eight hundred forty-nine million, seven hundred forty-five thousand, one hundred seventy-seven".