660155317 has 2 divisors, whose sum is σ = 660155318. Its totient is φ = 660155316.

The previous prime is 660155303. The next prime is 660155329. The reversal of 660155317 is 713551066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 478471876 + 181683441 = 21874^2 + 13479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660155317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660155347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330077658 + 330077659.

It is an arithmetic number, because the mean of its divisors is an integer number (330077659).

Almost surely, 2^660155317 is an apocalyptic number.

It is an amenable number.

660155317 is a deficient number, since it is larger than the sum of its proper divisors (1).

660155317 is an equidigital number, since it uses as much as digits as its factorization.

660155317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 660155317 is about 25693.4878325229. The cubic root of 660155317 is about 870.7270607849.

The spelling of 660155317 in words is "six hundred sixty million, one hundred fifty-five thousand, three hundred seventeen".