66365321 has 4 divisors (see below), whose sum is σ = 72398544. Its totient is φ = 60332100.

The previous prime is 66365303. The next prime is 66365323. The reversal of 66365321 is 12356366.

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 66365321 - 2¹⁴ = 66348937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66365323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3016595 + ... + 3016616.

It is an arithmetic number, because the mean of its divisors is an integer number (18099636).

Almost surely, 2^66365321 is an apocalyptic number.

It is an amenable number.

66365321 is a deficient number, since it is larger than the sum of its proper divisors (6033223).

66365321 is a wasteful number, since it uses less digits than its factorization.

66365321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6033222.

The product of its digits is 19440, while the sum is 32.

The square root of 66365321 is about 8146.4913306282. The cubic root of 66365321 is about 404.8682617813.

The spelling of 66365321 in words is "sixty-six million, three hundred sixty-five thousand, three hundred twenty-one".