16506423523 has 4 divisors (see below), whose sum is σ = 16632426888. Its totient is φ = 16380420160.

The previous prime is 16506423511. The next prime is 16506423529. The reversal of 16506423523 is 32532460561.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16506423523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16506423529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63001486 + ... + 63001747.

It is an arithmetic number, because the mean of its divisors is an integer number (4158106722).

Almost surely, 2^16506423523 is an apocalyptic number.

16506423523 is a deficient number, since it is larger than the sum of its proper divisors (126003365).

16506423523 is a wasteful number, since it uses less digits than its factorization.

16506423523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126003364.

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 16506423523 in words is "sixteen billion, five hundred six million, four hundred twenty-three thousand, five hundred twenty-three".