666334147 has 4 divisors (see below), whose sum is σ = 684343216. Its totient is φ = 648325080.

The previous prime is 666334139. The next prime is 666334153. The reversal of 666334147 is 741433666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 741433666 = 2 ⋅370716833.

It is a cyclic number.

It is not a de Polignac number, because 666334147 - 2³ = 666334139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666334157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9004479 + ... + 9004552.

It is an arithmetic number, because the mean of its divisors is an integer number (171085804).

Almost surely, 2^666334147 is an apocalyptic number.

666334147 is a deficient number, since it is larger than the sum of its proper divisors (18009069).

666334147 is a wasteful number, since it uses less digits than its factorization.

666334147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18009068.

The product of its digits is 217728, while the sum is 40.

The square root of 666334147 is about 25813.4489559222. The cubic root of 666334147 is about 873.4351992393.

The spelling of 666334147 in words is "six hundred sixty-six million, three hundred thirty-four thousand, one hundred forty-seven".