167665 has 4 divisors (see below), whose sum is σ = 201204. Its totient is φ = 134128.

The previous prime is 167663. The next prime is 167677. The reversal of 167665 is 566761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566761 = 13 ⋅43597.

It can be written as a sum of positive squares in 2 ways, for example, as 97969 + 69696 = 313^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 167665 - 2¹ = 167663 is a prime.

It is a super-2 number, since 2×167665² = 56223104450, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

167665 is a lucky number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (167663) 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, 16762 + ... + 16771.

It is an arithmetic number, because the mean of its divisors is an integer number (50301).

2¹⁶⁷⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

167665 is a deficient number, since it is larger than the sum of its proper divisors (33539).

167665 is an equidigital number, since it uses as much as digits as its factorization.

167665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33538.

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

The square root of 167665 is about 409.4691685585. The cubic root of 167665 is about 55.1417829480.

The spelling of 167665 in words is "one hundred sixty-seven thousand, six hundred sixty-five".