660720723 has 16 divisors (see below), whose sum is σ = 955659936. Its totient is φ = 403626240.

The previous prime is 660720721. The next prime is 660720727. The reversal of 660720723 is 327027066.

660720723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 660720723 - 2¹ = 660720721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660720721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56488 + ... + 67173.

It is an arithmetic number, because the mean of its divisors is an integer number (59728746).

Almost surely, 2^660720723 is an apocalyptic number.

660720723 is a deficient number, since it is larger than the sum of its proper divisors (294939213).

660720723 is a wasteful number, since it uses less digits than its factorization.

660720723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123814.

The product of its (nonzero) digits is 21168, while the sum is 33.

The square root of 660720723 is about 25704.4883823818. The cubic root of 660720723 is about 870.9755749387.

Adding to 660720723 its reverse (327027066), we get a palindrome (987747789).

The spelling of 660720723 in words is "six hundred sixty million, seven hundred twenty thousand, seven hundred twenty-three".