720221633 has 2 divisors, whose sum is σ = 720221634. Its totient is φ = 720221632.

The previous prime is 720221573. The next prime is 720221651. The reversal of 720221633 is 336122027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 582112129 + 138109504 = 24127^2 + 11752^2 .

It is a cyclic number.

It is not a de Polignac number, because 720221633 - 2⁸ = 720221377 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (720221933) 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 as a sum of consecutive naturals, namely, 360110816 + 360110817.

It is an arithmetic number, because the mean of its divisors is an integer number (360110817).

Almost surely, 2^720221633 is an apocalyptic number.

It is an amenable number.

720221633 is a deficient number, since it is larger than the sum of its proper divisors (1).

720221633 is an equidigital number, since it uses as much as digits as its factorization.

720221633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 720221633 is about 26836.9452993443. The cubic root of 720221633 is about 896.3729053561.

The spelling of 720221633 in words is "seven hundred twenty million, two hundred twenty-one thousand, six hundred thirty-three".