66004321 has 4 divisors (see below), whose sum is σ = 66255552. Its totient is φ = 65753092.

The previous prime is 66004307. The next prime is 66004327. The reversal of 66004321 is 12340066.

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 66004321 - 2¹¹ = 66002273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66004292 and 66004301.

It is not an unprimeable number, because it can be changed into a prime (66004327) 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, 125221 + ... + 125746.

It is an arithmetic number, because the mean of its divisors is an integer number (16563888).

Almost surely, 2^66004321 is an apocalyptic number.

It is an amenable number.

66004321 is a deficient number, since it is larger than the sum of its proper divisors (251231).

66004321 is a wasteful number, since it uses less digits than its factorization.

66004321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251230.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 66004321 is about 8124.3043394496. The cubic root of 66004321 is about 404.1328211617.

Adding to 66004321 its reverse (12340066), we get a palindrome (78344387).

The spelling of 66004321 in words is "sixty-six million, four thousand, three hundred twenty-one".