1643201633 has 2 divisors, whose sum is σ = 1643201634. Its totient is φ = 1643201632.

The previous prime is 1643201617. The next prime is 1643201647. The reversal of 1643201633 is 3361023461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 974875729 + 668325904 = 31223^2 + 25852^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643201633 - 2⁴ = 1643201617 is a prime.

It is a super-2 number, since 2×1643201633² = 5400223213387733378, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1643201596 and 1643201605.

It is not a weakly prime, because it can be changed into another prime (1643201653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821600816 + 821600817.

It is an arithmetic number, because the mean of its divisors is an integer number (821600817).

Almost surely, 2^1643201633 is an apocalyptic number.

It is an amenable number.

1643201633 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643201633 is an equidigital number, since it uses as much as digits as its factorization.

1643201633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 1643201633 is about 40536.4235348902. The cubic root of 1643201633 is about 1180.0406078623.

The spelling of 1643201633 in words is "one billion, six hundred forty-three million, two hundred one thousand, six hundred thirty-three".