66044867 has 4 divisors (see below), whose sum is σ = 75479856. Its totient is φ = 56609880.

The previous prime is 66044863. The next prime is 66044879. The reversal of 66044867 is 76844066.

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

It is a cyclic number.

It is not a de Polignac number, because 66044867 - 2² = 66044863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66044863) 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 3 ways as a sum of consecutive naturals, for example, 4717484 + ... + 4717497.

It is an arithmetic number, because the mean of its divisors is an integer number (18869964).

Almost surely, 2^66044867 is an apocalyptic number.

66044867 is a deficient number, since it is larger than the sum of its proper divisors (9434989).

66044867 is an equidigital number, since it uses as much as digits as its factorization.

66044867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9434988.

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 66044867 is about 8126.7993084609. The cubic root of 66044867 is about 404.2155562262.

The spelling of 66044867 in words is "sixty-six million, forty-four thousand, eight hundred sixty-seven".