47666 has 4 divisors (see below), whose sum is σ = 71502. Its totient is φ = 23832.

The previous prime is 47659. The next prime is 47681. The reversal of 47666 is 66674.

47666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 32041 + 15625 = 179^2 + 125^2 .

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11915 + ... + 11918.

2⁴⁷⁶⁶⁶ is an apocalyptic number.

47666 is a deficient number, since it is larger than the sum of its proper divisors (23836).

47666 is a wasteful number, since it uses less digits than its factorization.

47666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23835.

The product of its digits is 6048, while the sum is 29.

The square root of 47666 is about 218.3254451501. The cubic root of 47666 is about 36.2579213763.

The spelling of 47666 in words is "forty-seven thousand, six hundred sixty-six".