66573321 has 8 divisors (see below), whose sum is σ = 93436320. Its totient is φ = 42046272.

The previous prime is 66573313. The next prime is 66573361. The reversal of 66573321 is 12337566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66573321 - 2³ = 66573313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66573301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 583920 + ... + 584033.

It is an arithmetic number, because the mean of its divisors is an integer number (11679540).

Almost surely, 2^66573321 is an apocalyptic number.

It is an amenable number.

66573321 is a deficient number, since it is larger than the sum of its proper divisors (26862999).

66573321 is a wasteful number, since it uses less digits than its factorization.

66573321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167975.

The product of its digits is 22680, while the sum is 33.

The square root of 66573321 is about 8159.2475756040. The cubic root of 66573321 is about 405.2907955749.

The spelling of 66573321 in words is "sixty-six million, five hundred seventy-three thousand, three hundred twenty-one".