66027321 has 6 divisors (see below), whose sum is σ = 95372810. Its totient is φ = 44018208.

The previous prime is 66027293. The next prime is 66027323. The reversal of 66027321 is 12372066.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 61779600 + 4247721 = 7860^2 + 2061^2 .

It is not a de Polignac number, because 66027321 - 2⁵ = 66027289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66027323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3668176 + ... + 3668193.

Almost surely, 2^66027321 is an apocalyptic number.

It is an amenable number.

66027321 is a deficient number, since it is larger than the sum of its proper divisors (29345489).

66027321 is a wasteful number, since it uses less digits than its factorization.

66027321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7336375 (or 7336372 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 66027321 is about 8125.7197219692. The cubic root of 66027321 is about 404.1797573587.

Adding to 66027321 its reverse (12372066), we get a palindrome (78399387).

The spelling of 66027321 in words is "sixty-six million, twenty-seven thousand, three hundred twenty-one".