16918951423 has 4 divisors (see below), whose sum is σ = 18457037928. Its totient is φ = 15380864920.

The previous prime is 16918951381. The next prime is 16918951433. The reversal of 16918951423 is 32415981961.

It is a happy number.

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 16918951423 - 2¹³ = 16918943231 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16918951433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769043236 + ... + 769043257.

It is an arithmetic number, because the mean of its divisors is an integer number (4614259482).

Almost surely, 2^16918951423 is an apocalyptic number.

16918951423 is a deficient number, since it is larger than the sum of its proper divisors (1538086505).

16918951423 is a wasteful number, since it uses less digits than its factorization.

16918951423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538086504.

The product of its digits is 466560, while the sum is 49.

The spelling of 16918951423 in words is "sixteen billion, nine hundred eighteen million, nine hundred fifty-one thousand, four hundred twenty-three".