66414321 has 12 divisors (see below), whose sum is σ = 99240180. Its totient is φ = 42749280.

The previous prime is 66414311. The next prime is 66414347. The reversal of 66414321 is 12341466.

It can be written as a sum of positive squares in 2 ways, for example, as 16160400 + 50253921 = 4020^2 + 7089^2 .

It is not a de Polignac number, because 66414321 - 2⁵ = 66414289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66414311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126970 + ... + 127491.

It is an arithmetic number, because the mean of its divisors is an integer number (8270015).

Almost surely, 2^66414321 is an apocalyptic number.

It is an amenable number.

66414321 is a deficient number, since it is larger than the sum of its proper divisors (32825859).

66414321 is a wasteful number, since it uses less digits than its factorization.

66414321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254496 (or 254493 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 66414321 is about 8149.4982054112. The cubic root of 66414321 is about 404.9678803974.

Adding to 66414321 its reverse (12341466), we get a palindrome (78755787).

The spelling of 66414321 in words is "sixty-six million, four hundred fourteen thousand, three hundred twenty-one".