999721804033 has 2 divisors, whose sum is σ = 999721804034. Its totient is φ = 999721804032.

The previous prime is 999721804027. The next prime is 999721804087. The reversal of 999721804033 is 330408127999.

It is the 408192-nd star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 999554049729 + 167754304 = 999777^2 + 12952^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999721804033 is a prime.

It is not a weakly prime, because it can be changed into another prime (999721804933) 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, 499860902016 + 499860902017.

It is an arithmetic number, because the mean of its divisors is an integer number (499860902017).

Almost surely, 2^999721804033 is an apocalyptic number.

It is an amenable number.

999721804033 is a deficient number, since it is larger than the sum of its proper divisors (1).

999721804033 is an equidigital number, since it uses as much as digits as its factorization.

999721804033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 999721804033 in words is "nine hundred ninety-nine billion, seven hundred twenty-one million, eight hundred four thousand, thirty-three".