165571206671 has 8 divisors (see below), whose sum is σ = 179668580784. Its totient is φ = 151668279360.

The previous prime is 165571206667. The next prime is 165571206679. The reversal of 165571206671 is 176602175561.

It is a happy number.

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

It is not a de Polignac number, because 165571206671 - 2² = 165571206667 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 (165571206679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48609926 + ... + 48613331.

It is an arithmetic number, because the mean of its divisors is an integer number (22458572598).

Almost surely, 2^165571206671 is an apocalyptic number.

165571206671 is a deficient number, since it is larger than the sum of its proper divisors (14097374113).

165571206671 is a wasteful number, since it uses less digits than its factorization.

165571206671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97223401.

The product of its (nonzero) digits is 529200, while the sum is 47.

The spelling of 165571206671 in words is "one hundred sixty-five billion, five hundred seventy-one million, two hundred six thousand, six hundred seventy-one".