66338845 has 8 divisors (see below), whose sum is σ = 84289464. Its totient is φ = 49949184.

The previous prime is 66338843. The next prime is 66338917. The reversal of 66338845 is 54883366.

It can be written as a sum of positive squares in 4 ways, for example, as 18852964 + 47485881 = 4342^2 + 6891^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66338845 - 2¹ = 66338843 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66338843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390144 + ... + 390313.

It is an arithmetic number, because the mean of its divisors is an integer number (10536183).

Almost surely, 2^66338845 is an apocalyptic number.

It is an amenable number.

66338845 is a deficient number, since it is larger than the sum of its proper divisors (17950619).

66338845 is a wasteful number, since it uses less digits than its factorization.

66338845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780479.

The product of its digits is 414720, while the sum is 43.

The square root of 66338845 is about 8144.8661744684. The cubic root of 66338845 is about 404.8144147935.

The spelling of 66338845 in words is "sixty-six million, three hundred thirty-eight thousand, eight hundred forty-five".