31666 has 8 divisors (see below), whose sum is σ = 48384. Its totient is φ = 15540.

The previous prime is 31663. The next prime is 31667. The reversal of 31666 is 66613.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (31663) 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, 31 + ... + 253.

It is an arithmetic number, because the mean of its divisors is an integer number (6048).

2³¹⁶⁶⁶ is an apocalyptic number.

31666 is a deficient number, since it is larger than the sum of its proper divisors (16718).

31666 is a wasteful number, since it uses less digits than its factorization.

31666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296.

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

The square root of 31666 is about 177.9494310190. The cubic root of 31666 is about 31.6371778417.

The spelling of 31666 in words is "thirty-one thousand, six hundred sixty-six".