165782161 has 4 divisors (see below), whose sum is σ = 165925872. Its totient is φ = 165638452.

The previous prime is 165782131. The next prime is 165782167. The reversal of 165782161 is 161287561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165782161 - 2⁷ = 165782033 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 165782161.

It is not an unprimeable number, because it can be changed into a prime (165782167) 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, 70111 + ... + 72436.

It is an arithmetic number, because the mean of its divisors is an integer number (41481468).

Almost surely, 2^165782161 is an apocalyptic number.

It is an amenable number.

165782161 is a deficient number, since it is larger than the sum of its proper divisors (143711).

165782161 is a wasteful number, since it uses less digits than its factorization.

165782161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143710.

The product of its digits is 20160, while the sum is 37.

The square root of 165782161 is about 12875.6421587430. The cubic root of 165782161 is about 549.3459564235.

The spelling of 165782161 in words is "one hundred sixty-five million, seven hundred eighty-two thousand, one hundred sixty-one".