66636445 has 8 divisors (see below), whose sum is σ = 82125144. Its totient is φ = 51868224.

The previous prime is 66636443. The next prime is 66636457. The reversal of 66636445 is 54463666.

It can be written as a sum of positive squares in 4 ways, for example, as 12068676 + 54567769 = 3474^2 + 7387^2 .

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 66636445 - 2¹ = 66636443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66636398 and 66636407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66636443) 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, 179914 + ... + 180283.

It is an arithmetic number, because the mean of its divisors is an integer number (10265643).

Almost surely, 2^66636445 is an apocalyptic number.

It is an amenable number.

66636445 is a deficient number, since it is larger than the sum of its proper divisors (15488699).

66636445 is a wasteful number, since it uses less digits than its factorization.

66636445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360239.

The product of its digits is 311040, while the sum is 40.

The square root of 66636445 is about 8163.1149079258. The cubic root of 66636445 is about 405.4188523502.

It can be divided in two parts, 66636 and 445, that added together give a square (67081 = 259²).

The spelling of 66636445 in words is "sixty-six million, six hundred thirty-six thousand, four hundred forty-five".