729450661 has 2 divisors, whose sum is σ = 729450662. Its totient is φ = 729450660.

The previous prime is 729450647. The next prime is 729450697. The reversal of 729450661 is 166054927.

729450661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 719902561 + 9548100 = 26831^2 + 3090^2 .

It is a cyclic number.

It is not a de Polignac number, because 729450661 - 2⁵ = 729450629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (729450611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364725330 + 364725331.

It is an arithmetic number, because the mean of its divisors is an integer number (364725331).

Almost surely, 2^729450661 is an apocalyptic number.

It is an amenable number.

729450661 is a deficient number, since it is larger than the sum of its proper divisors (1).

729450661 is an equidigital number, since it uses as much as digits as its factorization.

729450661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 729450661 is about 27008.3442846836. The cubic root of 729450661 is about 900.1854189988.

The spelling of 729450661 in words is "seven hundred twenty-nine million, four hundred fifty thousand, six hundred sixty-one".