16541551623 has 4 divisors (see below), whose sum is σ = 22055402168. Its totient is φ = 11027701080.

The previous prime is 16541551577. The next prime is 16541551643. The reversal of 16541551623 is 32615514561.

16541551623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 16541551623 - 2²⁰ = 16540503047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16541551643) 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 3 ways as a sum of consecutive naturals, for example, 2756925268 + ... + 2756925273.

It is an arithmetic number, because the mean of its divisors is an integer number (5513850542).

Almost surely, 2^16541551623 is an apocalyptic number.

16541551623 is a deficient number, since it is larger than the sum of its proper divisors (5513850545).

16541551623 is an equidigital number, since it uses as much as digits as its factorization.

16541551623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5513850544.

The product of its digits is 108000, while the sum is 39.

The spelling of 16541551623 in words is "sixteen billion, five hundred forty-one million, five hundred fifty-one thousand, six hundred twenty-three".