729741661 has 4 divisors (see below), whose sum is σ = 796081824. Its totient is φ = 663401500.

The previous prime is 729741647. The next prime is 729741697. The reversal of 729741661 is 166147927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 729741661 - 2¹¹ = 729739613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729741641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33170065 + ... + 33170086.

It is an arithmetic number, because the mean of its divisors is an integer number (199020456).

Almost surely, 2^729741661 is an apocalyptic number.

It is an amenable number.

729741661 is a deficient number, since it is larger than the sum of its proper divisors (66340163).

729741661 is a wasteful number, since it uses less digits than its factorization.

729741661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66340162.

The product of its digits is 127008, while the sum is 43.

The square root of 729741661 is about 27013.7309714893. The cubic root of 729741661 is about 900.3051068428.

The spelling of 729741661 in words is "seven hundred twenty-nine million, seven hundred forty-one thousand, six hundred sixty-one".