66322381 has 2 divisors, whose sum is σ = 66322382. Its totient is φ = 66322380.

The previous prime is 66322351. The next prime is 66322397. The reversal of 66322381 is 18322366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45765225 + 20557156 = 6765^2 + 4534^2 .

It is a cyclic number.

It is not a de Polignac number, because 66322381 - 2⁵ = 66322349 is a prime.

It is a super-2 number, since 2×66322381² = 8797316443018322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66322301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33161190 + 33161191.

It is an arithmetic number, because the mean of its divisors is an integer number (33161191).

Almost surely, 2^66322381 is an apocalyptic number.

It is an amenable number.

66322381 is a deficient number, since it is larger than the sum of its proper divisors (1).

66322381 is an equidigital number, since it uses as much as digits as its factorization.

66322381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 66322381 is about 8143.8554137460. The cubic root of 66322381 is about 404.7809230238.

The spelling of 66322381 in words is "sixty-six million, three hundred twenty-two thousand, three hundred eighty-one".