16667623717 has 4 divisors (see below), whose sum is σ = 16677611980. Its totient is φ = 16657635456.

The previous prime is 16667623657. The next prime is 16667623727. The reversal of 16667623717 is 71732676661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2737487041 + 13930136676 = 52321^2 + 118026^2 .

It is a cyclic number.

It is not a de Polignac number, because 16667623717 - 2¹⁹ = 16667099429 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 (16667623727) 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, 4991628 + ... + 4994965.

It is an arithmetic number, because the mean of its divisors is an integer number (4169402995).

Almost surely, 2^16667623717 is an apocalyptic number.

It is an amenable number.

16667623717 is a deficient number, since it is larger than the sum of its proper divisors (9988263).

16667623717 is an equidigital number, since it uses as much as digits as its factorization.

16667623717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9988262.

The product of its digits is 2667168, while the sum is 52.

The spelling of 16667623717 in words is "sixteen billion, six hundred sixty-seven million, six hundred twenty-three thousand, seven hundred seventeen".