301666 has 4 divisors (see below), whose sum is σ = 452502. Its totient is φ = 150832.

The previous prime is 301657. The next prime is 301669. The reversal of 301666 is 666103.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666103 = 23 ⋅28961.

It can be written as a sum of positive squares in only one way, i.e., 164025 + 137641 = 405^2 + 371^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (301669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75415 + ... + 75418.

2³⁰¹⁶⁶⁶ is an apocalyptic number.

301666 is a deficient number, since it is larger than the sum of its proper divisors (150836).

301666 is a wasteful number, since it uses less digits than its factorization.

301666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150835.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 301666 is about 549.2412948787. The cubic root of 301666 is about 67.0669858018.

Adding to 301666 its reverse (666103), we get a palindrome (967769).

The spelling of 301666 in words is "three hundred one thousand, six hundred sixty-six".