660520297 has 2 divisors, whose sum is σ = 660520298. Its totient is φ = 660520296.

The previous prime is 660520277. The next prime is 660520349. The reversal of 660520297 is 792025066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 596776041 + 63744256 = 24429^2 + 7984^2 .

It is a cyclic number.

It is not a de Polignac number, because 660520297 - 2⁷ = 660520169 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (660520277) 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, 330260148 + 330260149.

It is an arithmetic number, because the mean of its divisors is an integer number (330260149).

Almost surely, 2^660520297 is an apocalyptic number.

It is an amenable number.

660520297 is a deficient number, since it is larger than the sum of its proper divisors (1).

660520297 is an equidigital number, since it uses as much as digits as its factorization.

660520297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 660520297 is about 25700.5894290384. The cubic root of 660520297 is about 870.8874974809.

The spelling of 660520297 in words is "six hundred sixty million, five hundred twenty thousand, two hundred ninety-seven".