66045671 has 4 divisors (see below), whose sum is σ = 66063144. Its totient is φ = 66028200.

The previous prime is 66045649. The next prime is 66045689. The reversal of 66045671 is 17654066.

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-66045671 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 (66045631) 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, 440 + ... + 11501.

It is an arithmetic number, because the mean of its divisors is an integer number (16515786).

Almost surely, 2^66045671 is an apocalyptic number.

66045671 is a deficient number, since it is larger than the sum of its proper divisors (17473).

66045671 is a wasteful number, since it uses less digits than its factorization.

66045671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17472.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 66045671 is about 8126.8487742790. The cubic root of 66045671 is about 404.2171964646.

The spelling of 66045671 in words is "sixty-six million, forty-five thousand, six hundred seventy-one".