66141947 has 2 divisors, whose sum is σ = 66141948. Its totient is φ = 66141946.

The previous prime is 66141937. The next prime is 66141991. The reversal of 66141947 is 74914166.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66141947 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66141947.

It is not a weakly prime, because it can be changed into another prime (66141937) 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 as a sum of consecutive naturals, namely, 33070973 + 33070974.

It is an arithmetic number, because the mean of its divisors is an integer number (33070974).

Almost surely, 2^66141947 is an apocalyptic number.

66141947 is a deficient number, since it is larger than the sum of its proper divisors (1).

66141947 is an equidigital number, since it uses as much as digits as its factorization.

66141947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 66141947 is about 8132.7699463344. The cubic root of 66141947 is about 404.4135127398.

The spelling of 66141947 in words is "sixty-six million, one hundred forty-one thousand, nine hundred forty-seven".