16438916550 has 192 divisors, whose sum is σ = 47293401600. Its totient is φ = 3701376000.

The previous prime is 16438916531. The next prime is 16438916621. The reversal of 16438916550 is 5561983461.

It is a self number, because there is not a number n which added to its sum of digits gives 16438916550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 40192746 + ... + 40193154.

It is an arithmetic number, because the mean of its divisors is an integer number (246319800).

Almost surely, 2^16438916550 is an apocalyptic number.

16438916550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16438916550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23646700800).

16438916550 is an abundant number, since it is smaller than the sum of its proper divisors (30854485050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16438916550 is a wasteful number, since it uses less digits than its factorization.

16438916550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911 (or 906 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 48.

The spelling of 16438916550 in words is "sixteen billion, four hundred thirty-eight million, nine hundred sixteen thousand, five hundred fifty".