165705216667 has 8 divisors (see below), whose sum is σ = 174535797200. Its totient is φ = 156885561504.

The previous prime is 165705216643. The next prime is 165705216671. The reversal of 165705216667 is 766612507561.

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

It is not a de Polignac number, because 165705216667 - 2⁷ = 165705216539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165705216637) 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, 2700192 + ... + 2760877.

It is an arithmetic number, because the mean of its divisors is an integer number (21816974650).

Almost surely, 2^165705216667 is an apocalyptic number.

165705216667 is a deficient number, since it is larger than the sum of its proper divisors (8830580533).

165705216667 is a wasteful number, since it uses less digits than its factorization.

165705216667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5462685.

The product of its (nonzero) digits is 3175200, while the sum is 52.

The spelling of 165705216667 in words is "one hundred sixty-five billion, seven hundred five million, two hundred sixteen thousand, six hundred sixty-seven".