16856551623 has 8 divisors (see below), whose sum is σ = 22693610368. Its totient is φ = 11128596984.

The previous prime is 16856551597. The next prime is 16856551633. The reversal of 16856551623 is 32615565861.

It is a happy number.

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

It is not a de Polignac number, because 16856551623 - 2⁹ = 16856551111 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 (16856551633) 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 7 ways as a sum of consecutive naturals, for example, 27275665 + ... + 27276282.

It is an arithmetic number, because the mean of its divisors is an integer number (2836701296).

Almost surely, 2^16856551623 is an apocalyptic number.

16856551623 is a deficient number, since it is larger than the sum of its proper divisors (5837058745).

16856551623 is a wasteful number, since it uses less digits than its factorization.

16856551623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54552053.

The product of its digits is 1296000, while the sum is 48.

The spelling of 16856551623 in words is "sixteen billion, eight hundred fifty-six million, five hundred fifty-one thousand, six hundred twenty-three".