66000047 has 2 divisors, whose sum is σ = 66000048. Its totient is φ = 66000046.

The previous prime is 66000043. The next prime is 66000049. The reversal of 66000047 is 74000066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66000047 - 2² = 66000043 is a prime.

Together with 66000049, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 65999986 and 66000031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66000043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000023 + 33000024.

It is an arithmetic number, because the mean of its divisors is an integer number (33000024).

Almost surely, 2^66000047 is an apocalyptic number.

66000047 is a deficient number, since it is larger than the sum of its proper divisors (1).

66000047 is an equidigital number, since it uses as much as digits as its factorization.

66000047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 66000047 is about 8124.0412972855. The cubic root of 66000047 is about 404.1240979906.

The spelling of 66000047 in words is "sixty-six million, forty-seven", and thus it is an aban number and an uban number.