721543043233009 has 2 divisors, whose sum is σ = 721543043233010. Its totient is φ = 721543043233008.

The previous prime is 721543043232967. The next prime is 721543043233013. The reversal of 721543043233009 is 900332340345127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 715671644161600 + 5871399071409 = 26752040^2 + 2423097^2 .

It is a cyclic number.

It is not a de Polignac number, because 721543043233009 - 2³⁹ = 720993287419121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721543043233009.

It is not a weakly prime, because it can be changed into another prime (721543043233069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360771521616504 + 360771521616505.

It is an arithmetic number, because the mean of its divisors is an integer number (360771521616505).

Almost surely, 2^{721543043233009} is an apocalyptic number.

It is an amenable number.

721543043233009 is a deficient number, since it is larger than the sum of its proper divisors (1).

721543043233009 is an equidigital number, since it uses as much as digits as its factorization.

721543043233009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 46.

The spelling of 721543043233009 in words is "seven hundred twenty-one trillion, five hundred forty-three billion, forty-three million, two hundred thirty-three thousand, nine".