66159671 has 4 divisors (see below), whose sum is σ = 67698312. Its totient is φ = 64621032.

The previous prime is 66159659. The next prime is 66159677. The reversal of 66159671 is 17695166.

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 66159671 - 2⁶ = 66159607 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 (66159677) 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, 769256 + ... + 769341.

It is an arithmetic number, because the mean of its divisors is an integer number (16924578).

Almost surely, 2^66159671 is an apocalyptic number.

66159671 is a deficient number, since it is larger than the sum of its proper divisors (1538641).

66159671 is a wasteful number, since it uses less digits than its factorization.

66159671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538640.

The product of its digits is 68040, while the sum is 41.

The square root of 66159671 is about 8133.8595389889. The cubic root of 66159671 is about 404.4496329594.

The spelling of 66159671 in words is "sixty-six million, one hundred fifty-nine thousand, six hundred seventy-one".