16668718723 has 4 divisors (see below), whose sum is σ = 17393445648. Its totient is φ = 15943991800.

The previous prime is 16668718699. The next prime is 16668718741. The reversal of 16668718723 is 32781786661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16668718723 - 2⁵ = 16668718691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16668718793) 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, 362363428 + ... + 362363473.

It is an arithmetic number, because the mean of its divisors is an integer number (4348361412).

Almost surely, 2^16668718723 is an apocalyptic number.

16668718723 is a deficient number, since it is larger than the sum of its proper divisors (724726925).

16668718723 is an equidigital number, since it uses as much as digits as its factorization.

16668718723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724726924.

The product of its digits is 4064256, while the sum is 55.

The spelling of 16668718723 in words is "sixteen billion, six hundred sixty-eight million, seven hundred eighteen thousand, seven hundred twenty-three".