66973313 has 4 divisors (see below), whose sum is σ = 73061808. Its totient is φ = 60884820.

The previous prime is 66973307. The next prime is 66973343. The reversal of 66973313 is 31337966.

It is a happy number.

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-66973313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66973343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3044231 + ... + 3044252.

It is an arithmetic number, because the mean of its divisors is an integer number (18265452).

Almost surely, 2^66973313 is an apocalyptic number.

It is an amenable number.

66973313 is a deficient number, since it is larger than the sum of its proper divisors (6088495).

66973313 is a wasteful number, since it uses less digits than its factorization.

66973313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6088494.

The product of its digits is 61236, while the sum is 38.

The square root of 66973313 is about 8183.7224415299. The cubic root of 66973313 is about 406.1008772443.

It can be divided in two parts, 66 and 973313, that added together give a palindrome (973379).

The spelling of 66973313 in words is "sixty-six million, nine hundred seventy-three thousand, three hundred thirteen".