66450347 has 4 divisors (see below), whose sum is σ = 67095600. Its totient is φ = 65805096.

The previous prime is 66450341. The next prime is 66450379. The reversal of 66450347 is 74305466.

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 66450347 - 2¹⁸ = 66188203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66450341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322472 + ... + 322677.

It is an arithmetic number, because the mean of its divisors is an integer number (16773900).

Almost surely, 2^66450347 is an apocalyptic number.

66450347 is a deficient number, since it is larger than the sum of its proper divisors (645253).

66450347 is a wasteful number, since it uses less digits than its factorization.

66450347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645252.

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 66450347 is about 8151.7082258874. The cubic root of 66450347 is about 405.0410911922.

The spelling of 66450347 in words is "sixty-six million, four hundred fifty thousand, three hundred forty-seven".