66330511321 has 4 divisors (see below), whose sum is σ = 67129674192. Its totient is φ = 65531348452.

The previous prime is 66330511301. The next prime is 66330511327. The reversal of 66330511321 is 12311503366.

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 66330511321 - 2⁷ = 66330511193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66330511327) 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, 399581311 + ... + 399581476.

It is an arithmetic number, because the mean of its divisors is an integer number (16782418548).

Almost surely, 2^66330511321 is an apocalyptic number.

It is an amenable number.

66330511321 is a deficient number, since it is larger than the sum of its proper divisors (799162871).

66330511321 is an equidigital number, since it uses as much as digits as its factorization.

66330511321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799162870.

The product of its (nonzero) digits is 9720, while the sum is 31.

The spelling of 66330511321 in words is "sixty-six billion, three hundred thirty million, five hundred eleven thousand, three hundred twenty-one".