721543043233013 has 2 divisors, whose sum is σ = 721543043233014. Its totient is φ = 721543043233012.

The previous prime is 721543043233009. The next prime is 721543043233069. The reversal of 721543043233013 is 310332340345127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 444148122331684 + 277394920901329 = 21074822^2 + 16655177^2 .

It is a cyclic number.

It is not a de Polignac number, because 721543043233013 - 2² = 721543043233009 is a prime.

It is a super-2 number, since 2×721543043233013² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721543043233913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360771521616506 + 360771521616507.

It is an arithmetic number, because the mean of its divisors is an integer number (360771521616507).

Almost surely, 2^{721543043233013} is an apocalyptic number.

It is an amenable number.

721543043233013 is a deficient number, since it is larger than the sum of its proper divisors (1).

721543043233013 is an equidigital number, since it uses as much as digits as its factorization.

721543043233013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 41.

The spelling of 721543043233013 in words is "seven hundred twenty-one trillion, five hundred forty-three billion, forty-three million, two hundred thirty-three thousand, thirteen".