66385273 has 4 divisors (see below), whose sum is σ = 68004468. Its totient is φ = 64766080.

The previous prime is 66385271. The next prime is 66385279. The reversal of 66385273 is 37258366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2832489 + 63552784 = 1683^2 + 7972^2 .

It is a cyclic number.

It is not a de Polignac number, because 66385273 - 2¹ = 66385271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66385271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 809536 + ... + 809617.

It is an arithmetic number, because the mean of its divisors is an integer number (17001117).

Almost surely, 2^66385273 is an apocalyptic number.

It is an amenable number.

66385273 is a deficient number, since it is larger than the sum of its proper divisors (1619195).

66385273 is a wasteful number, since it uses less digits than its factorization.

66385273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619194.

The product of its digits is 181440, while the sum is 40.

The square root of 66385273 is about 8147.7158148772. The cubic root of 66385273 is about 404.9088307715.

It can be divided in two parts, 6638 and 5273, that added together give a palindrome (11911).

The spelling of 66385273 in words is "sixty-six million, three hundred eighty-five thousand, two hundred seventy-three".