66730818 has 32 divisors (see below), whose sum is σ = 166394880. Its totient is φ = 17332560.

The previous prime is 66730813. The next prime is 66730823. The reversal of 66730818 is 81803766.

It is an interprime number because it is at equal distance from previous prime (66730813) and next prime (66730823).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66730813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71758 + ... + 72681.

It is an arithmetic number, because the mean of its divisors is an integer number (5199840).

Almost surely, 2^66730818 is an apocalyptic number.

66730818 is an abundant number, since it is smaller than the sum of its proper divisors (99664062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66730818 is a wasteful number, since it uses less digits than its factorization.

66730818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144462.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 66730818 is about 8168.8933154987. The cubic root of 66730818 is about 405.6101517986.

The spelling of 66730818 in words is "sixty-six million, seven hundred thirty thousand, eight hundred eighteen".