73666 has 4 divisors (see below), whose sum is σ = 110502. Its totient is φ = 36832.

The previous prime is 73651. The next prime is 73673. The reversal of 73666 is 66637.

73666 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66637 = 37 ⋅1801.

It can be written as a sum of positive squares in only one way, i.e., 73441 + 225 = 271^2 + 15^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18415 + ... + 18418.

2⁷³⁶⁶⁶ is an apocalyptic number.

73666 is a deficient number, since it is larger than the sum of its proper divisors (36836).

73666 is a wasteful number, since it uses less digits than its factorization.

73666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36835.

The product of its digits is 4536, while the sum is 28.

The square root of 73666 is about 271.4148116813. The cubic root of 73666 is about 41.9201051072.

The spelling of 73666 in words is "seventy-three thousand, six hundred sixty-six".