66855473 has 2 divisors, whose sum is σ = 66855474. Its totient is φ = 66855472.

The previous prime is 66855463. The next prime is 66855491. The reversal of 66855473 is 37455866.

66855473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58721569 + 8133904 = 7663^2 + 2852^2 .

It is a cyclic number.

It is not a de Polignac number, because 66855473 - 2¹² = 66851377 is a prime.

It is not a weakly prime, because it can be changed into another prime (66855463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33427736 + 33427737.

It is an arithmetic number, because the mean of its divisors is an integer number (33427737).

Almost surely, 2^66855473 is an apocalyptic number.

It is an amenable number.

66855473 is a deficient number, since it is larger than the sum of its proper divisors (1).

66855473 is an equidigital number, since it uses as much as digits as its factorization.

66855473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 44.

The square root of 66855473 is about 8176.5196141146. The cubic root of 66855473 is about 405.8625583293.

The spelling of 66855473 in words is "sixty-six million, eight hundred fifty-five thousand, four hundred seventy-three".