165571561116071 has 8 divisors (see below), whose sum is σ = 191248434230544. Its totient is φ = 141665506837120.

The previous prime is 165571561116047. The next prime is 165571561116103. The reversal of 165571561116071 is 170611165175561.

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

It is a cyclic number.

It is not a de Polignac number, because 165571561116071 - 2¹⁰ = 165571561115047 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 (165571561116001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442704708680 + ... + 442704709053.

It is an arithmetic number, because the mean of its divisors is an integer number (23906054278818).

Almost surely, 2^{165571561116071} is an apocalyptic number.

165571561116071 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165571561116071 is a deficient number, since it is larger than the sum of its proper divisors (25676873114473).

165571561116071 is a wasteful number, since it uses less digits than its factorization.

165571561116071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885409417761.

The product of its (nonzero) digits is 1323000, while the sum is 53.

The spelling of 165571561116071 in words is "one hundred sixty-five trillion, five hundred seventy-one billion, five hundred sixty-one million, one hundred sixteen thousand, seventy-one".