721665056670029 has 2 divisors, whose sum is σ = 721665056670030. Its totient is φ = 721665056670028.

The previous prime is 721665056670011. The next prime is 721665056670121. The reversal of 721665056670029 is 920076650566127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 690746152202500 + 30918904467529 = 26282050^2 + 5560477^2 .

It is a cyclic number.

It is not a de Polignac number, because 721665056670029 - 2²⁴ = 721665039892813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721665056670629) 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, 360832528335014 + 360832528335015.

It is an arithmetic number, because the mean of its divisors is an integer number (360832528335015).

Almost surely, 2^{721665056670029} is an apocalyptic number.

It is an amenable number.

721665056670029 is a deficient number, since it is larger than the sum of its proper divisors (1).

721665056670029 is an equidigital number, since it uses as much as digits as its factorization.

721665056670029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57153600, while the sum is 62.

The spelling of 721665056670029 in words is "seven hundred twenty-one trillion, six hundred sixty-five billion, fifty-six million, six hundred seventy thousand, twenty-nine".