66510473 has 4 divisors (see below), whose sum is σ = 67311888. Its totient is φ = 65709060.

The previous prime is 66510467. The next prime is 66510491. The reversal of 66510473 is 37401566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66510473 - 2¹⁰ = 66509449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66510463) 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 in 3 ways as a sum of consecutive naturals, for example, 400583 + ... + 400748.

It is an arithmetic number, because the mean of its divisors is an integer number (16827972).

Almost surely, 2^66510473 is an apocalyptic number.

It is an amenable number.

66510473 is a deficient number, since it is larger than the sum of its proper divisors (801415).

66510473 is an equidigital number, since it uses as much as digits as its factorization.

66510473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801414.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 66510473 is about 8155.3953306998. The cubic root of 66510473 is about 405.1632182651.

The spelling of 66510473 in words is "sixty-six million, five hundred ten thousand, four hundred seventy-three".