66151321 has 2 divisors, whose sum is σ = 66151322. Its totient is φ = 66151320.

The previous prime is 66151307. The next prime is 66151333. The reversal of 66151321 is 12315166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44890000 + 21261321 = 6700^2 + 4611^2 .

It is a cyclic number.

It is not a de Polignac number, because 66151321 - 2⁷ = 66151193 is a prime.

It is not a weakly prime, because it can be changed into another prime (66151391) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33075660 + 33075661.

It is an arithmetic number, because the mean of its divisors is an integer number (33075661).

Almost surely, 2^66151321 is an apocalyptic number.

It is an amenable number.

66151321 is a deficient number, since it is larger than the sum of its proper divisors (1).

66151321 is an equidigital number, since it uses as much as digits as its factorization.

66151321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 25.

The square root of 66151321 is about 8133.3462363286. The cubic root of 66151321 is about 404.4326170721.

Adding to 66151321 its reverse (12315166), we get a palindrome (78466487).

The spelling of 66151321 in words is "sixty-six million, one hundred fifty-one thousand, three hundred twenty-one".