66955547 has 2 divisors, whose sum is σ = 66955548. Its totient is φ = 66955546.

The previous prime is 66955531. The next prime is 66955549. The reversal of 66955547 is 74555966.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66955547 - 2⁴ = 66955531 is a prime.

Together with 66955549, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66955549) 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, 33477773 + 33477774.

It is an arithmetic number, because the mean of its divisors is an integer number (33477774).

Almost surely, 2^66955547 is an apocalyptic number.

66955547 is a deficient number, since it is larger than the sum of its proper divisors (1).

66955547 is an equidigital number, since it uses as much as digits as its factorization.

66955547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134000, while the sum is 47.

The square root of 66955547 is about 8182.6369221664. The cubic root of 66955547 is about 406.0649652972.

The spelling of 66955547 in words is "sixty-six million, nine hundred fifty-five thousand, five hundred forty-seven".