66075847 has 4 divisors (see below), whose sum is σ = 66130000. Its totient is φ = 66021696.

The previous prime is 66075791. The next prime is 66075851. The reversal of 66075847 is 74857066.

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 66075847 - 2¹⁹ = 65551559 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66175847) 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, 25203 + ... + 27700.

It is an arithmetic number, because the mean of its divisors is an integer number (16532500).

Almost surely, 2^66075847 is an apocalyptic number.

66075847 is a deficient number, since it is larger than the sum of its proper divisors (54153).

66075847 is a wasteful number, since it uses less digits than its factorization.

66075847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54152.

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 66075847 is about 8128.7051244340. The cubic root of 66075847 is about 404.2787488254.

The spelling of 66075847 in words is "sixty-six million, seventy-five thousand, eight hundred forty-seven".