165930939540871 has 4 divisors (see below), whose sum is σ = 167399354935152. Its totient is φ = 164462524146592.

The previous prime is 165930939540857. The next prime is 165930939540973. The reversal of 165930939540871 is 178045939039561.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165930939540871 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165930939540871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165930939540271) 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, 734207696971 + ... + 734207697196.

It is an arithmetic number, because the mean of its divisors is an integer number (41849838733788).

Almost surely, 2^{165930939540871} is an apocalyptic number.

165930939540871 is a deficient number, since it is larger than the sum of its proper divisors (1468415394281).

165930939540871 is a wasteful number, since it uses less digits than its factorization.

165930939540871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468415394280.

The product of its (nonzero) digits is 220449600, while the sum is 70.

The spelling of 165930939540871 in words is "one hundred sixty-five trillion, nine hundred thirty billion, nine hundred thirty-nine million, five hundred forty thousand, eight hundred seventy-one".