66241139 has 4 divisors (see below), whose sum is σ = 66357720. Its totient is φ = 66124560.

The previous prime is 66241111. The next prime is 66241151. The reversal of 66241139 is 93114266.

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 66241139 - 2⁸ = 66240883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66241039) 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, 57434 + ... + 58575.

It is an arithmetic number, because the mean of its divisors is an integer number (16589430).

Almost surely, 2^66241139 is an apocalyptic number.

66241139 is a deficient number, since it is larger than the sum of its proper divisors (116581).

66241139 is a wasteful number, since it uses less digits than its factorization.

66241139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116580.

The product of its digits is 7776, while the sum is 32.

The square root of 66241139 is about 8138.8659529446. The cubic root of 66241139 is about 404.6155758813.

The spelling of 66241139 in words is "sixty-six million, two hundred forty-one thousand, one hundred thirty-nine".