165065840771 has 8 divisors (see below), whose sum is σ = 183497510784. Its totient is φ = 147453356160.

The previous prime is 165065840761. The next prime is 165065840777. The reversal of 165065840771 is 177048560561.

It is a happy number.

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 165065840771 - 2⁶ = 165065840707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165065840777) 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, 204795926 + ... + 204796731.

It is an arithmetic number, because the mean of its divisors is an integer number (22937188848).

Almost surely, 2^165065840771 is an apocalyptic number.

165065840771 is a deficient number, since it is larger than the sum of its proper divisors (18431670013).

165065840771 is a wasteful number, since it uses less digits than its factorization.

165065840771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409592701.

The product of its (nonzero) digits is 1411200, while the sum is 50.

The spelling of 165065840771 in words is "one hundred sixty-five billion, sixty-five million, eight hundred forty thousand, seven hundred seventy-one".