66481213 has 8 divisors (see below), whose sum is σ = 68241600. Its totient is φ = 64727520.

The previous prime is 66481189. The next prime is 66481229. The reversal of 66481213 is 31218466.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-66481213 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 (66481243) 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 7 ways as a sum of consecutive naturals, for example, 23206 + ... + 25912.

It is an arithmetic number, because the mean of its divisors is an integer number (8530200).

Almost surely, 2^66481213 is an apocalyptic number.

It is an amenable number.

66481213 is a deficient number, since it is larger than the sum of its proper divisors (1760387).

66481213 is a wasteful number, since it uses less digits than its factorization.

66481213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3347.

The product of its digits is 6912, while the sum is 31.

The square root of 66481213 is about 8153.6012289049. The cubic root of 66481213 is about 405.1037949687.

Adding to 66481213 its reverse (31218466), we get a palindrome (97699679).

The spelling of 66481213 in words is "sixty-six million, four hundred eighty-one thousand, two hundred thirteen".