66284321 has 8 divisors (see below), whose sum is σ = 69249600. Its totient is φ = 63326032.

The previous prime is 66284269. The next prime is 66284327. The reversal of 66284321 is 12348266.

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

It is a cyclic number.

It is not a de Polignac number, because 66284321 - 2¹⁴ = 66267937 is a prime.

It is a super-2 number, since 2×66284321² = 8787222420862082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66284327) 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, 30530 + ... + 32628.

It is an arithmetic number, because the mean of its divisors is an integer number (8656200).

Almost surely, 2^66284321 is an apocalyptic number.

It is an amenable number.

66284321 is a deficient number, since it is larger than the sum of its proper divisors (2965279).

66284321 is a wasteful number, since it uses less digits than its factorization.

66284321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3495.

The product of its digits is 13824, while the sum is 32.

The square root of 66284321 is about 8141.5183473355. The cubic root of 66284321 is about 404.7034785291.

The spelling of 66284321 in words is "sixty-six million, two hundred eighty-four thousand, three hundred twenty-one".