729370657021 has 2 divisors, whose sum is σ = 729370657022. Its totient is φ = 729370657020.

The previous prime is 729370656929. The next prime is 729370657039. The reversal of 729370657021 is 120756073927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 729297212121 + 73444900 = 853989^2 + 8570^2 .

It is a cyclic number.

It is not a de Polignac number, because 729370657021 - 2²⁵ = 729337102589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (729370657051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364685328510 + 364685328511.

It is an arithmetic number, because the mean of its divisors is an integer number (364685328511).

Almost surely, 2^729370657021 is an apocalyptic number.

It is an amenable number.

729370657021 is a deficient number, since it is larger than the sum of its proper divisors (1).

729370657021 is an equidigital number, since it uses as much as digits as its factorization.

729370657021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1111320, while the sum is 49.

The spelling of 729370657021 in words is "seven hundred twenty-nine billion, three hundred seventy million, six hundred fifty-seven thousand, twenty-one".