66448439 has 2 divisors, whose sum is σ = 66448440. Its totient is φ = 66448438.

The previous prime is 66448433. The next prime is 66448441. The reversal of 66448439 is 93484466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66448439 is a prime.

Together with 66448441, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66448439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66448433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33224219 + 33224220.

It is an arithmetic number, because the mean of its divisors is an integer number (33224220).

Almost surely, 2^66448439 is an apocalyptic number.

66448439 is a deficient number, since it is larger than the sum of its proper divisors (1).

66448439 is an equidigital number, since it uses as much as digits as its factorization.

66448439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 44.

The square root of 66448439 is about 8151.5911943620. The cubic root of 66448439 is about 405.0372144841.

The spelling of 66448439 in words is "sixty-six million, four hundred forty-eight thousand, four hundred thirty-nine".