66284473 has 2 divisors, whose sum is σ = 66284474. Its totient is φ = 66284472.

The previous prime is 66284461. The next prime is 66284489. The reversal of 66284473 is 37448266.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53978409 + 12306064 = 7347^2 + 3508^2 .

It is a cyclic number.

It is not a de Polignac number, because 66284473 - 2⁹ = 66283961 is a prime.

It is not a weakly prime, because it can be changed into another prime (66284423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33142236 + 33142237.

It is an arithmetic number, because the mean of its divisors is an integer number (33142237).

Almost surely, 2^66284473 is an apocalyptic number.

It is an amenable number.

66284473 is a deficient number, since it is larger than the sum of its proper divisors (1).

66284473 is an equidigital number, since it uses as much as digits as its factorization.

66284473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 40.

The square root of 66284473 is about 8141.5276821982. The cubic root of 66284473 is about 404.7037878777.

The spelling of 66284473 in words is "sixty-six million, two hundred eighty-four thousand, four hundred seventy-three".