16423108781 has 8 divisors (see below), whose sum is σ = 16795197720. Its totient is φ = 16053324352.

The previous prime is 16423108771. The next prime is 16423108799. The reversal of 16423108781 is 18780132461.

16423108781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1193080681 + 15230028100 = 34541^2 + 123410^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16423108781 is a prime.

It is a super-2 number, since 2×16423108781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16423108721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561710 + ... + 590223.

It is an arithmetic number, because the mean of its divisors is an integer number (2099399715).

Almost surely, 2^16423108781 is an apocalyptic number.

It is an amenable number.

16423108781 is a deficient number, since it is larger than the sum of its proper divisors (372088939).

16423108781 is a wasteful number, since it uses less digits than its factorization.

16423108781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152255.

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 16423108781 in words is "sixteen billion, four hundred twenty-three million, one hundred eight thousand, seven hundred eighty-one".