66281671 has 8 divisors (see below), whose sum is σ = 69920000. Its totient is φ = 62658360.

The previous prime is 66281659. The next prime is 66281687. The reversal of 66281671 is 17618266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66281671 - 2⁵ = 66281639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66281671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66287671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5986 + ... + 12976.

It is an arithmetic number, because the mean of its divisors is an integer number (8740000).

Almost surely, 2^66281671 is an apocalyptic number.

66281671 is a deficient number, since it is larger than the sum of its proper divisors (3638329).

66281671 is a wasteful number, since it uses less digits than its factorization.

66281671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7509.

The product of its digits is 24192, while the sum is 37.

The square root of 66281671 is about 8141.3555996529. The cubic root of 66281671 is about 404.6980852049.

The spelling of 66281671 in words is "sixty-six million, two hundred eighty-one thousand, six hundred seventy-one".