66258449 has 2 divisors, whose sum is σ = 66258450. Its totient is φ = 66258448.

The previous prime is 66258373. The next prime is 66258487. The reversal of 66258449 is 94485266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63043600 + 3214849 = 7940^2 + 1793^2 .

It is a cyclic number.

It is not a de Polignac number, because 66258449 - 2¹⁶ = 66192913 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66258949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33129224 + 33129225.

It is an arithmetic number, because the mean of its divisors is an integer number (33129225).

Almost surely, 2^66258449 is an apocalyptic number.

It is an amenable number.

66258449 is a deficient number, since it is larger than the sum of its proper divisors (1).

66258449 is an equidigital number, since it uses as much as digits as its factorization.

66258449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 44.

The square root of 66258449 is about 8139.9292994473. The cubic root of 66258449 is about 404.6508172521.

The spelling of 66258449 in words is "sixty-six million, two hundred fifty-eight thousand, four hundred forty-nine".