660547 has 2 divisors, whose sum is σ = 660548. Its totient is φ = 660546.

The previous prime is 660529. The next prime is 660557. The reversal of 660547 is 745066.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660547 is a prime.

660547 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (660557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330273 + 330274.

It is an arithmetic number, because the mean of its divisors is an integer number (330274).

2⁶⁶⁰⁵⁴⁷ is an apocalyptic number.

660547 is a deficient number, since it is larger than the sum of its proper divisors (1).

660547 is an equidigital number, since it uses as much as digits as its factorization.

660547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 660547 is about 812.7404259664. The cubic root of 660547 is about 87.0899233176.

The spelling of 660547 in words is "six hundred sixty thousand, five hundred forty-seven".