166587 has 4 divisors (see below), whose sum is σ = 222120. Its totient is φ = 111056.

The previous prime is 166571. The next prime is 166597. The reversal of 166587 is 785661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 785661 = 3 ⋅261887.

It is a cyclic number.

It is not a de Polignac number, because 166587 - 2⁴ = 166571 is a prime.

It is a D-number.

166587 is a lucky number.

It is a plaindrome in base 15 and base 16.

It is not an unprimeable number, because it can be changed into a prime (166567) 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, 27762 + ... + 27767.

It is an arithmetic number, because the mean of its divisors is an integer number (55530).

2¹⁶⁶⁵⁸⁷ is an apocalyptic number.

166587 is a deficient number, since it is larger than the sum of its proper divisors (55533).

166587 is an equidigital number, since it uses as much as digits as its factorization.

166587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55532.

The product of its digits is 10080, while the sum is 33.

The square root of 166587 is about 408.1507074599. The cubic root of 166587 is about 55.0233509662.

The spelling of 166587 in words is "one hundred sixty-six thousand, five hundred eighty-seven".