66332447 has 4 divisors (see below), whose sum is σ = 66354696. Its totient is φ = 66310200.

The previous prime is 66332443. The next prime is 66332459. The reversal of 66332447 is 74423366.

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

It is a cyclic number.

It is not a de Polignac number, because 66332447 - 2² = 66332443 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 (66332443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5804 + ... + 12897.

It is an arithmetic number, because the mean of its divisors is an integer number (16588674).

Almost surely, 2^66332447 is an apocalyptic number.

66332447 is a deficient number, since it is larger than the sum of its proper divisors (22249).

66332447 is a wasteful number, since it uses less digits than its factorization.

66332447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22248.

The product of its digits is 72576, while the sum is 35.

The square root of 66332447 is about 8144.4734022526. The cubic root of 66332447 is about 404.8014003679.

The spelling of 66332447 in words is "sixty-six million, three hundred thirty-two thousand, four hundred forty-seven".