666147 has 8 divisors (see below), whose sum is σ = 892944. Its totient is φ = 441728.

The previous prime is 666143. The next prime is 666167. The reversal of 666147 is 741666.

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

It is a cyclic number.

It is not a de Polignac number, because 666147 - 2² = 666143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223 + ... + 1175.

It is an arithmetic number, because the mean of its divisors is an integer number (111618).

2⁶⁶⁶¹⁴⁷ is an apocalyptic number.

666147 is a deficient number, since it is larger than the sum of its proper divisors (226797).

666147 is a wasteful number, since it uses less digits than its factorization.

666147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189.

The product of its digits is 6048, while the sum is 30.

The square root of 666147 is about 816.1782893461. The cubic root of 666147 is about 87.3353420408.

The spelling of 666147 in words is "six hundred sixty-six thousand, one hundred forty-seven".