16505006423 has 4 divisors (see below), whose sum is σ = 16505296200. Its totient is φ = 16504716648.

The previous prime is 16505006387. The next prime is 16505006459. The reversal of 16505006423 is 32460050561.

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

It is an interprime number because it is at equal distance from previous prime (16505006387) and next prime (16505006459).

It is a cyclic number.

It is not a de Polignac number, because 16505006423 - 2¹⁸ = 16504744279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16505006423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505006473) 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, 28040 + ... + 183837.

It is an arithmetic number, because the mean of its divisors is an integer number (4126324050).

Almost surely, 2^16505006423 is an apocalyptic number.

16505006423 is a deficient number, since it is larger than the sum of its proper divisors (289777).

16505006423 is an equidigital number, since it uses as much as digits as its factorization.

16505006423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289776.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 16505006423 its reverse (32460050561), we get a palindrome (48965056984).

The spelling of 16505006423 in words is "sixteen billion, five hundred five million, six thousand, four hundred twenty-three".