660171247 has 2 divisors, whose sum is σ = 660171248. Its totient is φ = 660171246.

The previous prime is 660171241. The next prime is 660171269. The reversal of 660171247 is 742171066.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660171247 - 2¹¹ = 660169199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660171241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330085623 + 330085624.

It is an arithmetic number, because the mean of its divisors is an integer number (330085624).

Almost surely, 2^660171247 is an apocalyptic number.

660171247 is a deficient number, since it is larger than the sum of its proper divisors (1).

660171247 is an equidigital number, since it uses as much as digits as its factorization.

660171247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 660171247 is about 25693.7978313834. The cubic root of 660171247 is about 870.7340644754.

The spelling of 660171247 in words is "six hundred sixty million, one hundred seventy-one thousand, two hundred forty-seven".