66784241 has 4 divisors (see below), whose sum is σ = 66850800. Its totient is φ = 66717684.

The previous prime is 66784231. The next prime is 66784271. The reversal of 66784241 is 14248766.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66784241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66784195 and 66784204.

It is not an unprimeable number, because it can be changed into a prime (66784231) 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, 31751 + ... + 33788.

It is an arithmetic number, because the mean of its divisors is an integer number (16712700).

Almost surely, 2^66784241 is an apocalyptic number.

It is an amenable number.

66784241 is a deficient number, since it is larger than the sum of its proper divisors (66559).

66784241 is a wasteful number, since it uses less digits than its factorization.

66784241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66558.

The product of its digits is 64512, while the sum is 38.

The square root of 66784241 is about 8172.1625656860. The cubic root of 66784241 is about 405.7183633258.

The spelling of 66784241 in words is "sixty-six million, seven hundred eighty-four thousand, two hundred forty-one".