66544329 has 4 divisors (see below), whose sum is σ = 88725776. Its totient is φ = 44362884.

The previous prime is 66544301. The next prime is 66544363. The reversal of 66544329 is 92344566.

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 not a de Polignac number, because 66544329 - 2⁵ = 66544297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66544529) 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, 11090719 + ... + 11090724.

It is an arithmetic number, because the mean of its divisors is an integer number (22181444).

Almost surely, 2^66544329 is an apocalyptic number.

It is an amenable number.

66544329 is a deficient number, since it is larger than the sum of its proper divisors (22181447).

66544329 is a wasteful number, since it uses less digits than its factorization.

66544329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22181446.

The product of its digits is 155520, while the sum is 39.

The square root of 66544329 is about 8157.4707477257. The cubic root of 66544329 is about 405.2319537011.

The spelling of 66544329 in words is "sixty-six million, five hundred forty-four thousand, three hundred twenty-nine".