66560449 has 2 divisors, whose sum is σ = 66560450. Its totient is φ = 66560448.

The previous prime is 66560419. The next prime is 66560467. The reversal of 66560449 is 94406566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48650625 + 17909824 = 6975^2 + 4232^2 .

It is a cyclic number.

It is not a de Polignac number, because 66560449 - 2⁹ = 66559937 is a prime.

It is not a weakly prime, because it can be changed into another prime (66560419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33280224 + 33280225.

It is an arithmetic number, because the mean of its divisors is an integer number (33280225).

Almost surely, 2^66560449 is an apocalyptic number.

It is an amenable number.

66560449 is a deficient number, since it is larger than the sum of its proper divisors (1).

66560449 is an equidigital number, since it uses as much as digits as its factorization.

66560449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 66560449 is about 8158.4587392473. The cubic root of 66560449 is about 405.2646728012.

The spelling of 66560449 in words is "sixty-six million, five hundred sixty thousand, four hundred forty-nine".