721180335431641 has 2 divisors, whose sum is σ = 721180335431642. Its totient is φ = 721180335431640.

The previous prime is 721180335431603. The next prime is 721180335431747. The reversal of 721180335431641 is 146134533081127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 447515408793600 + 273664926638041 = 21154560^2 + 16542821^2 .

It is a cyclic number.

It is not a de Polignac number, because 721180335431641 - 2⁷ = 721180335431513 is a prime.

It is not a weakly prime, because it can be changed into another prime (721180335431041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360590167715820 + 360590167715821.

It is an arithmetic number, because the mean of its divisors is an integer number (360590167715821).

Almost surely, 2^{721180335431641} is an apocalyptic number.

It is an amenable number.

721180335431641 is a deficient number, since it is larger than the sum of its proper divisors (1).

721180335431641 is an equidigital number, since it uses as much as digits as its factorization.

721180335431641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 721180335431641 in words is "seven hundred twenty-one trillion, one hundred eighty billion, three hundred thirty-five million, four hundred thirty-one thousand, six hundred forty-one".