66447513 has 48 divisors (see below), whose sum is σ = 110854080. Its totient is φ = 39334680.

The previous prime is 66447473. The next prime is 66447517. The reversal of 66447513 is 31574466.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

66447513 is a `hidden beast` number, since 6 + 644 + 7 + 5 + 1 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-66447513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66447517) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1545270 + ... + 1545312.

It is an arithmetic number, because the mean of its divisors is an integer number (2309460).

Almost surely, 2^66447513 is an apocalyptic number.

It is an amenable number.

66447513 is a deficient number, since it is larger than the sum of its proper divisors (44406567).

66447513 is an equidigital number, since it uses as much as digits as its factorization.

66447513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 57 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 66447513 is about 8151.5343954375. The cubic root of 66447513 is about 405.0353329942.

The spelling of 66447513 in words is "sixty-six million, four hundred forty-seven thousand, five hundred thirteen".