66643313 has 8 divisors (see below), whose sum is σ = 74074176. Its totient is φ = 59441200.

The previous prime is 66643303. The next prime is 66643319. The reversal of 66643313 is 31334666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66643313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66643313.

It is not an unprimeable number, because it can be changed into a prime (66643319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56573 + ... + 57738.

It is an arithmetic number, because the mean of its divisors is an integer number (9259272).

Almost surely, 2^66643313 is an apocalyptic number.

It is an amenable number.

66643313 is a deficient number, since it is larger than the sum of its proper divisors (7430863).

66643313 is a wasteful number, since it uses less digits than its factorization.

66643313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114375.

The product of its digits is 23328, while the sum is 32.

The square root of 66643313 is about 8163.5355698374. The cubic root of 66643313 is about 405.4327802692.

Adding to 66643313 its reverse (31334666), we get a palindrome (97977979).

The spelling of 66643313 in words is "sixty-six million, six hundred forty-three thousand, three hundred thirteen".