660208247 has 2 divisors, whose sum is σ = 660208248. Its totient is φ = 660208246.

The previous prime is 660208207. The next prime is 660208273. The reversal of 660208247 is 742802066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660208247 - 2⁶ = 660208183 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660208207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330104123 + 330104124.

It is an arithmetic number, because the mean of its divisors is an integer number (330104124).

Almost surely, 2^660208247 is an apocalyptic number.

660208247 is a deficient number, since it is larger than the sum of its proper divisors (1).

660208247 is an equidigital number, since it uses as much as digits as its factorization.

660208247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 660208247 is about 25694.5178394147. The cubic root of 660208247 is about 870.7503312439.

The spelling of 660208247 in words is "six hundred sixty million, two hundred eight thousand, two hundred forty-seven".