165766 has 4 divisors (see below), whose sum is σ = 248652. Its totient is φ = 82882.

The previous prime is 165749. The next prime is 165779. The reversal of 165766 is 667561.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41440 + ... + 41443.

It is an arithmetic number, because the mean of its divisors is an integer number (62163).

2¹⁶⁵⁷⁶⁶ is an apocalyptic number.

165766 is the 258-th centered pentagonal number.

165766 is a deficient number, since it is larger than the sum of its proper divisors (82886).

165766 is an equidigital number, since it uses as much as digits as its factorization.

165766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82885.

The product of its digits is 7560, while the sum is 31.

The square root of 165766 is about 407.1437092723. The cubic root of 165766 is about 54.9328105149.

The spelling of 165766 in words is "one hundred sixty-five thousand, seven hundred sixty-six".