19966633 has 2 divisors, whose sum is σ = 19966634. Its totient is φ = 19966632.

The previous prime is 19966621. The next prime is 19966649. The reversal of 19966633 is 33666991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19954089 + 12544 = 4467^2 + 112^2 .

It is a cyclic number.

It is not a de Polignac number, because 19966633 - 2⁵ = 19966601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19966633.

It is not a weakly prime, because it can be changed into another prime (19966613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9983316 + 9983317.

It is an arithmetic number, because the mean of its divisors is an integer number (9983317).

Almost surely, 2^19966633 is an apocalyptic number.

It is an amenable number.

19966633 is a deficient number, since it is larger than the sum of its proper divisors (1).

19966633 is an equidigital number, since it uses as much as digits as its factorization.

19966633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 43.

The square root of 19966633 is about 4468.4038537267. The cubic root of 19966633 is about 271.2907243463.

The spelling of 19966633 in words is "nineteen million, nine hundred sixty-six thousand, six hundred thirty-three".