66352213 has 4 divisors (see below), whose sum is σ = 66372160. Its totient is φ = 66332268.

The previous prime is 66352193. The next prime is 66352219. The reversal of 66352213 is 31225366.

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 a de Polignac number, because none of the positive numbers 2^k-66352213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66352219) 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, 3645 + ... + 12082.

It is an arithmetic number, because the mean of its divisors is an integer number (16593040).

Almost surely, 2^66352213 is an apocalyptic number.

It is an amenable number.

66352213 is a deficient number, since it is larger than the sum of its proper divisors (19947).

66352213 is a wasteful number, since it uses less digits than its factorization.

66352213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19946.

The product of its digits is 6480, while the sum is 28.

The square root of 66352213 is about 8145.6867727651. The cubic root of 66352213 is about 404.8416044722.

Adding to 66352213 its reverse (31225366), we get a palindrome (97577579).

The spelling of 66352213 in words is "sixty-six million, three hundred fifty-two thousand, two hundred thirteen".