723666663 has 16 divisors (see below), whose sum is σ = 1080288000. Its totient is φ = 478759320.

The previous prime is 723666649. The next prime is 723666673. The reversal of 723666663 is 366666327.

723666663 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 723666663 - 2⁵ = 723666631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723666613) 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, 98763 + ... + 105836.

It is an arithmetic number, because the mean of its divisors is an integer number (67518000).

Almost surely, 2^723666663 is an apocalyptic number.

723666663 is a deficient number, since it is larger than the sum of its proper divisors (356621337).

723666663 is a wasteful number, since it uses less digits than its factorization.

723666663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204739 (or 204733 counting only the distinct ones).

The product of its digits is 979776, while the sum is 45.

The square root of 723666663 is about 26901.0531949959. The cubic root of 723666663 is about 897.7998369189.

The spelling of 723666663 in words is "seven hundred twenty-three million, six hundred sixty-six thousand, six hundred sixty-three".