660742297 has 2 divisors, whose sum is σ = 660742298. Its totient is φ = 660742296.

The previous prime is 660742289. The next prime is 660742373. The reversal of 660742297 is 792247066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645718921 + 15023376 = 25411^2 + 3876^2 .

It is a cyclic number.

It is not a de Polignac number, because 660742297 - 2³ = 660742289 is a prime.

It is not a weakly prime, because it can be changed into another prime (660742217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330371148 + 330371149.

It is an arithmetic number, because the mean of its divisors is an integer number (330371149).

Almost surely, 2^660742297 is an apocalyptic number.

It is an amenable number.

660742297 is a deficient number, since it is larger than the sum of its proper divisors (1).

660742297 is an equidigital number, since it uses as much as digits as its factorization.

660742297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 660742297 is about 25704.9080332920. The cubic root of 660742297 is about 870.9850545982.

The spelling of 660742297 in words is "six hundred sixty million, seven hundred forty-two thousand, two hundred ninety-seven".