66338916 has 24 divisors (see below), whose sum is σ = 176904000. Its totient is φ = 18953952.

The previous prime is 66338843. The next prime is 66338917. The reversal of 66338916 is 61983366.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (66338917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394791 + ... + 394958.

It is an arithmetic number, because the mean of its divisors is an integer number (7371000).

Almost surely, 2^66338916 is an apocalyptic number.

It is an amenable number.

66338916 is an abundant number, since it is smaller than the sum of its proper divisors (110565084).

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

66338916 is a wasteful number, since it uses less digits than its factorization.

66338916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789763 (or 789761 counting only the distinct ones).

The product of its digits is 139968, while the sum is 42.

The square root of 66338916 is about 8144.8705330410. The cubic root of 66338916 is about 404.8145592127.

The spelling of 66338916 in words is "sixty-six million, three hundred thirty-eight thousand, nine hundred sixteen".