66447133 has 4 divisors (see below), whose sum is σ = 67193820. Its totient is φ = 65700448.

The previous prime is 66447131. The next prime is 66447151. The reversal of 66447133 is 33174466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17489124 + 48958009 = 4182^2 + 6997^2 .

It is a cyclic number.

It is not a de Polignac number, because 66447133 - 2¹ = 66447131 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 (66447131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 373210 + ... + 373387.

It is an arithmetic number, because the mean of its divisors is an integer number (16798455).

Almost surely, 2^66447133 is an apocalyptic number.

It is an amenable number.

66447133 is a deficient number, since it is larger than the sum of its proper divisors (746687).

66447133 is an equidigital number, since it uses as much as digits as its factorization.

66447133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746686.

The product of its digits is 36288, while the sum is 34.

The square root of 66447133 is about 8151.5110869090. The cubic root of 66447133 is about 405.0345608875.

The spelling of 66447133 in words is "sixty-six million, four hundred forty-seven thousand, one hundred thirty-three".