16506545623 has 8 divisors (see below), whose sum is σ = 16547631408. Its totient is φ = 16465510464.

The previous prime is 16506545617. The next prime is 16506545647. The reversal of 16506545623 is 32654560561.

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

It is a cyclic number.

It is not a de Polignac number, because 16506545623 - 2⁵ = 16506545591 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 16506545623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16506545683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687540 + ... + 711142.

It is an arithmetic number, because the mean of its divisors is an integer number (2068453926).

Almost surely, 2^16506545623 is an apocalyptic number.

16506545623 is a deficient number, since it is larger than the sum of its proper divisors (41085785).

16506545623 is a wasteful number, since it uses less digits than its factorization.

16506545623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25313.

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 16506545623 in words is "sixteen billion, five hundred six million, five hundred forty-five thousand, six hundred twenty-three".