16506131423 has 4 divisors (see below), whose sum is σ = 16545338808. Its totient is φ = 16466924040.

The previous prime is 16506131417. The next prime is 16506131431. The reversal of 16506131423 is 32413160561.

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 16506131423 - 2⁸ = 16506131167 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 16506131423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16506131413) 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, 19603061 + ... + 19603902.

It is an arithmetic number, because the mean of its divisors is an integer number (4136334702).

Almost surely, 2^16506131423 is an apocalyptic number.

16506131423 is a deficient number, since it is larger than the sum of its proper divisors (39207385).

16506131423 is an equidigital number, since it uses as much as digits as its factorization.

16506131423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39207384.

The product of its (nonzero) digits is 12960, while the sum is 32.

Adding to 16506131423 its reverse (32413160561), we get a palindrome (48919291984).

The spelling of 16506131423 in words is "sixteen billion, five hundred six million, one hundred thirty-one thousand, four hundred twenty-three".