165858167 has 4 divisors (see below), whose sum is σ = 165898560. Its totient is φ = 165817776.

The previous prime is 165858149. The next prime is 165858169. The reversal of 165858167 is 761858561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 761858561 = 19 ⋅40097819.

It is a cyclic number.

It is not a de Polignac number, because 165858167 - 2¹² = 165854071 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165858169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13238 + ... + 22515.

It is an arithmetic number, because the mean of its divisors is an integer number (41474640).

Almost surely, 2^165858167 is an apocalyptic number.

165858167 is a deficient number, since it is larger than the sum of its proper divisors (40393).

165858167 is an equidigital number, since it uses as much as digits as its factorization.

165858167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40392.

The product of its digits is 403200, while the sum is 47.

The square root of 165858167 is about 12878.5933626309. The cubic root of 165858167 is about 549.4298963143.

The spelling of 165858167 in words is "one hundred sixty-five million, eight hundred fifty-eight thousand, one hundred sixty-seven".