66784903 has 2 divisors, whose sum is σ = 66784904. Its totient is φ = 66784902.

The previous prime is 66784901. The next prime is 66784909. The reversal of 66784903 is 30948766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66784903 - 2¹ = 66784901 is a prime.

Together with 66784901, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66784903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66784901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33392451 + 33392452.

It is an arithmetic number, because the mean of its divisors is an integer number (33392452).

Almost surely, 2^66784903 is an apocalyptic number.

66784903 is a deficient number, since it is larger than the sum of its proper divisors (1).

66784903 is an equidigital number, since it uses as much as digits as its factorization.

66784903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 66784903 is about 8172.2030689405. The cubic root of 66784903 is about 405.7197038850.

The spelling of 66784903 in words is "sixty-six million, seven hundred eighty-four thousand, nine hundred three".