66481513 has 16 divisors (see below), whose sum is σ = 80283520. Its totient is φ = 53778816.

The previous prime is 66481507. The next prime is 66481517. The reversal of 66481513 is 31518466.

It is a happy number.

It is not a de Polignac number, because 66481513 - 2¹³ = 66473321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66481517) 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 15 ways as a sum of consecutive naturals, for example, 40831 + ... + 42427.

It is an arithmetic number, because the mean of its divisors is an integer number (5017720).

Almost surely, 2^66481513 is an apocalyptic number.

It is an amenable number.

66481513 is a deficient number, since it is larger than the sum of its proper divisors (13802007).

66481513 is a wasteful number, since it uses less digits than its factorization.

66481513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936.

The product of its digits is 17280, while the sum is 34.

The square root of 66481513 is about 8153.6196256632. The cubic root of 66481513 is about 405.1044043185.

Adding to 66481513 its reverse (31518466), we get a palindrome (97999979).

The spelling of 66481513 in words is "sixty-six million, four hundred eighty-one thousand, five hundred thirteen".