16668823943 has 4 divisors (see below), whose sum is σ = 16679990088. Its totient is φ = 16657657800.

The previous prime is 16668823933. The next prime is 16668823979. The reversal of 16668823943 is 34932886661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34932886661 = 733 ⋅47657417.

It is a cyclic number.

It is not a de Polignac number, because 16668823943 - 2⁸ = 16668823687 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 (16668823933) 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, 5580833 + ... + 5583818.

It is an arithmetic number, because the mean of its divisors is an integer number (4169997522).

Almost surely, 2^16668823943 is an apocalyptic number.

16668823943 is a deficient number, since it is larger than the sum of its proper divisors (11166145).

16668823943 is a wasteful number, since it uses less digits than its factorization.

16668823943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11166144.

The product of its digits is 8957952, while the sum is 56.

The spelling of 16668823943 in words is "sixteen billion, six hundred sixty-eight million, eight hundred twenty-three thousand, nine hundred forty-three".