660457247 has 2 divisors, whose sum is σ = 660457248. Its totient is φ = 660457246.

The previous prime is 660457243. The next prime is 660457267. The reversal of 660457247 is 742754066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660457247 - 2² = 660457243 is a prime.

It is a super-3 number, since 3×660457247³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660457241) 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, 330228623 + 330228624.

It is an arithmetic number, because the mean of its divisors is an integer number (330228624).

Almost surely, 2^660457247 is an apocalyptic number.

660457247 is a deficient number, since it is larger than the sum of its proper divisors (1).

660457247 is an equidigital number, since it uses as much as digits as its factorization.

660457247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 41.

The square root of 660457247 is about 25699.3627742012. The cubic root of 660457247 is about 870.8597863950.

The spelling of 660457247 in words is "six hundred sixty million, four hundred fifty-seven thousand, two hundred forty-seven".