66287321 has 8 divisors (see below), whose sum is σ = 67413024. Its totient is φ = 65165760.

The previous prime is 66287317. The next prime is 66287327. The reversal of 66287321 is 12378266.

It is a happy number.

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 66287321 - 2² = 66287317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66287327) 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, 58466 + ... + 59588.

It is an arithmetic number, because the mean of its divisors is an integer number (8426628).

Almost surely, 2^66287321 is an apocalyptic number.

It is an amenable number.

66287321 is a deficient number, since it is larger than the sum of its proper divisors (1125703).

66287321 is a wasteful number, since it uses less digits than its factorization.

66287321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071.

The product of its digits is 24192, while the sum is 35.

The square root of 66287321 is about 8141.7025860688. The cubic root of 66287321 is about 404.7095840058.

The spelling of 66287321 in words is "sixty-six million, two hundred eighty-seven thousand, three hundred twenty-one".