158866 has 4 divisors (see below), whose sum is σ = 238302. Its totient is φ = 79432.

The previous prime is 158863. The next prime is 158867. The reversal of 158866 is 668851.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 108241 + 50625 = 329^2 + 225^2 .

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (158863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39715 + ... + 39718.

2¹⁵⁸⁸⁶⁶ is an apocalyptic number.

158866 is a deficient number, since it is larger than the sum of its proper divisors (79436).

158866 is an equidigital number, since it uses as much as digits as its factorization.

158866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79435.

The product of its digits is 11520, while the sum is 34.

The square root of 158866 is about 398.5799794270. The cubic root of 158866 is about 54.1597918954.

It can be divided in two parts, 158 and 866, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 158866 in words is "one hundred fifty-eight thousand, eight hundred sixty-six".