66108916 has 12 divisors (see below), whose sum is σ = 116468100. Its totient is φ = 32832320.

The previous prime is 66108907. The next prime is 66108941. The reversal of 66108916 is 61980166.

It can be written as a sum of positive squares in 2 ways, for example, as 2044900 + 64064016 = 1430^2 + 8004^2 .

It is a congruent number.

It is an unprimeable number.

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, 54865 + ... + 56056.

It is an arithmetic number, because the mean of its divisors is an integer number (9705675).

Almost surely, 2^66108916 is an apocalyptic number.

It is an amenable number.

66108916 is a deficient number, since it is larger than the sum of its proper divisors (50359184).

66108916 is a wasteful number, since it uses less digits than its factorization.

66108916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111074 (or 111072 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 66108916 is about 8130.7389578070. The cubic root of 66108916 is about 404.3461807484.

The spelling of 66108916 in words is "sixty-six million, one hundred eight thousand, nine hundred sixteen".