66562321 has 4 divisors (see below), whose sum is σ = 76071232. Its totient is φ = 57053412.

The previous prime is 66562313. The next prime is 66562367. The reversal of 66562321 is 12326566.

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 66562321 - 2³ = 66562313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66562381) 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, 4754445 + ... + 4754458.

It is an arithmetic number, because the mean of its divisors is an integer number (19017808).

Almost surely, 2^66562321 is an apocalyptic number.

It is an amenable number.

66562321 is a deficient number, since it is larger than the sum of its proper divisors (9508911).

66562321 is an equidigital number, since it uses as much as digits as its factorization.

66562321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9508910.

The product of its digits is 12960, while the sum is 31.

The square root of 66562321 is about 8158.5734659927. The cubic root of 66562321 is about 405.2684720963.

Adding to 66562321 its reverse (12326566), we get a palindrome (78888887).

The spelling of 66562321 in words is "sixty-six million, five hundred sixty-two thousand, three hundred twenty-one".