66448423 has 4 divisors (see below), whose sum is σ = 66579480. Its totient is φ = 66317368.

The previous prime is 66448409. The next prime is 66448433. The reversal of 66448423 is 32484466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66448423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66448433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64765 + ... + 65782.

It is an arithmetic number, because the mean of its divisors is an integer number (16644870).

Almost surely, 2^66448423 is an apocalyptic number.

66448423 is a deficient number, since it is larger than the sum of its proper divisors (131057).

66448423 is a wasteful number, since it uses less digits than its factorization.

66448423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131056.

The product of its digits is 110592, while the sum is 37.

The square root of 66448423 is about 8151.5902129585. The cubic root of 66448423 is about 405.0371819747.

The spelling of 66448423 in words is "sixty-six million, four hundred forty-eight thousand, four hundred twenty-three".