158566 has 4 divisors (see below), whose sum is σ = 237852. Its totient is φ = 79282.

The previous prime is 158563. The next prime is 158567. The reversal of 158566 is 665851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 665851 = 311 ⋅2141.

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 not an unprimeable number, because it can be changed into a prime (158563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39640 + ... + 39643.

It is an arithmetic number, because the mean of its divisors is an integer number (59463).

2¹⁵⁸⁵⁶⁶ is an apocalyptic number.

158566 is a deficient number, since it is larger than the sum of its proper divisors (79286).

158566 is an equidigital number, since it uses as much as digits as its factorization.

158566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79285.

The product of its digits is 7200, while the sum is 31.

The square root of 158566 is about 398.2034655801. The cubic root of 158566 is about 54.1256789202.

The spelling of 158566 in words is "one hundred fifty-eight thousand, five hundred sixty-six".