66842671 has 4 divisors (see below), whose sum is σ = 76391632. Its totient is φ = 57293712.

The previous prime is 66842663. The next prime is 66842681. The reversal of 66842671 is 17624866.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66842671 - 2³ = 66842663 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 (66842621) 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, 4774470 + ... + 4774483.

It is an arithmetic number, because the mean of its divisors is an integer number (19097908).

Almost surely, 2^66842671 is an apocalyptic number.

66842671 is a deficient number, since it is larger than the sum of its proper divisors (9548961).

66842671 is an equidigital number, since it uses as much as digits as its factorization.

66842671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9548960.

The product of its digits is 96768, while the sum is 40.

The square root of 66842671 is about 8175.7367252132. The cubic root of 66842671 is about 405.8366507812.

The spelling of 66842671 in words is "sixty-six million, eight hundred forty-two thousand, six hundred seventy-one".