66571671 has 8 divisors (see below), whose sum is σ = 89131504. Its totient is φ = 44196480.

The previous prime is 66571667. The next prime is 66571717. The reversal of 66571671 is 17617566.

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

It is not a de Polignac number, because 66571671 - 2² = 66571667 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 (66571171) 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 7 ways as a sum of consecutive naturals, for example, 45316 + ... + 46761.

It is an arithmetic number, because the mean of its divisors is an integer number (11141438).

Almost surely, 2^66571671 is an apocalyptic number.

66571671 is a deficient number, since it is larger than the sum of its proper divisors (22559833).

66571671 is a wasteful number, since it uses less digits than its factorization.

66571671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92321.

The product of its digits is 52920, while the sum is 39.

The square root of 66571671 is about 8159.1464627129. The cubic root of 66571671 is about 405.2874472098.

The spelling of 66571671 in words is "sixty-six million, five hundred seventy-one thousand, six hundred seventy-one".