64666473 has 4 divisors (see below), whose sum is σ = 86221968. Its totient is φ = 43110980.

The previous prime is 64666451. The next prime is 64666489. The reversal of 64666473 is 37466646.

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 64666473 - 2⁹ = 64665961 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64666373) 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, 10777743 + ... + 10777748.

It is an arithmetic number, because the mean of its divisors is an integer number (21555492).

Almost surely, 2^64666473 is an apocalyptic number.

It is an amenable number.

64666473 is a deficient number, since it is larger than the sum of its proper divisors (21555495).

64666473 is a wasteful number, since it uses less digits than its factorization.

64666473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21555494.

The product of its digits is 435456, while the sum is 42.

The square root of 64666473 is about 8041.5466795884. The cubic root of 64666473 is about 401.3836933790.

The spelling of 64666473 in words is "sixty-four million, six hundred sixty-six thousand, four hundred seventy-three".