66440116 has 6 divisors (see below), whose sum is σ = 116270210. Its totient is φ = 33220056.

The previous prime is 66440113. The next prime is 66440119. The reversal of 66440116 is 61104466.

It is an interprime number because it is at equal distance from previous prime (66440113) and next prime (66440119).

It can be written as a sum of positive squares in only one way, i.e., 65448100 + 992016 = 8090^2 + 996^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66440113) 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 as a sum of consecutive naturals, namely, 8305011 + ... + 8305018.

Almost surely, 2^66440116 is an apocalyptic number.

It is an amenable number.

66440116 is a deficient number, since it is larger than the sum of its proper divisors (49830094).

66440116 is a wasteful number, since it uses less digits than its factorization.

66440116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16610033 (or 16610031 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 66440116 is about 8151.0806645499. The cubic root of 66440116 is about 405.0203027977.

The spelling of 66440116 in words is "sixty-six million, four hundred forty thousand, one hundred sixteen".