660338417 has 2 divisors, whose sum is σ = 660338418. Its totient is φ = 660338416.

The previous prime is 660338387. The next prime is 660338449. The reversal of 660338417 is 714833066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 604373056 + 55965361 = 24584^2 + 7481^2 .

It is a cyclic number.

It is not a de Polignac number, because 660338417 - 2²² = 656144113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (660338477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330169208 + 330169209.

It is an arithmetic number, because the mean of its divisors is an integer number (330169209).

Almost surely, 2^660338417 is an apocalyptic number.

It is an amenable number.

660338417 is a deficient number, since it is larger than the sum of its proper divisors (1).

660338417 is an equidigital number, since it uses as much as digits as its factorization.

660338417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 660338417 is about 25697.0507451731. The cubic root of 660338417 is about 870.8075546643.

The spelling of 660338417 in words is "six hundred sixty million, three hundred thirty-eight thousand, four hundred seventeen".