729160221897 has 6 divisors (see below), whose sum is σ = 1053231431642. Its totient is φ = 486106814592.

The previous prime is 729160221887. The next prime is 729160221917. The reversal of 729160221897 is 798122061927.

729160221897 is a `hidden beast` number, since 7 + 2 + 9 + 1 + 602 + 21 + 8 + 9 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 711777381561 + 17382840336 = 843669^2 + 131844^2 .

It is not a de Polignac number, because 729160221897 - 2⁸ = 729160221641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (729160221827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40508901208 + ... + 40508901225.

Almost surely, 2^729160221897 is an apocalyptic number.

It is an amenable number.

729160221897 is a deficient number, since it is larger than the sum of its proper divisors (324071209745).

729160221897 is a wasteful number, since it uses less digits than its factorization.

729160221897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81017802439 (or 81017802436 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The spelling of 729160221897 in words is "seven hundred twenty-nine billion, one hundred sixty million, two hundred twenty-one thousand, eight hundred ninety-seven".