70165 has 4 divisors (see below), whose sum is σ = 84204. Its totient is φ = 56128.

The previous prime is 70163. The next prime is 70177. The reversal of 70165 is 56107.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56107 = 19 ⋅2953.

It can be written as a sum of positive squares in 2 ways, for example, as 15876 + 54289 = 126^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 70165 - 2¹ = 70163 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

70165 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70163) 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, 7012 + ... + 7021.

It is an arithmetic number, because the mean of its divisors is an integer number (21051).

2⁷⁰¹⁶⁵ is an apocalyptic number.

It is an amenable number.

70165 is a deficient number, since it is larger than the sum of its proper divisors (14039).

70165 is a wasteful number, since it uses less digits than its factorization.

70165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14038.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 70165 is about 264.8867682615. The cubic root of 70165 is about 41.2452091161.

It can be divided in two parts, 7016 and 5, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 70165 in words is "seventy thousand, one hundred sixty-five".