66560849 has 2 divisors, whose sum is σ = 66560850. Its totient is φ = 66560848.

The previous prime is 66560843. The next prime is 66560863. The reversal of 66560849 is 94806566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38130625 + 28430224 = 6175^2 + 5332^2 .

It is a cyclic number.

It is not a de Polignac number, because 66560849 - 2²⁰ = 65512273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66560843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33280424 + 33280425.

It is an arithmetic number, because the mean of its divisors is an integer number (33280425).

Almost surely, 2^66560849 is an apocalyptic number.

It is an amenable number.

66560849 is a deficient number, since it is larger than the sum of its proper divisors (1).

66560849 is an equidigital number, since it uses as much as digits as its factorization.

66560849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 66560849 is about 8158.4832536446. The cubic root of 66560849 is about 405.2654846224.

The spelling of 66560849 in words is "sixty-six million, five hundred sixty thousand, eight hundred forty-nine".