16211666550 has 96 divisors (see below), whose sum is σ = 41701821984. Its totient is φ = 4164480000.

The previous prime is 16211666521. The next prime is 16211666557. The reversal of 16211666550 is 5566611261.

It is a junction number, because it is equal to n+sod(n) for n = 16211666499 and 16211666508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16211666557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 546090 + ... + 575010.

It is an arithmetic number, because the mean of its divisors is an integer number (434393979).

Almost surely, 2^16211666550 is an apocalyptic number.

16211666550 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 16211666550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20850910992).

16211666550 is an abundant number, since it is smaller than the sum of its proper divisors (25490155434).

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

16211666550 is a wasteful number, since it uses less digits than its factorization.

16211666550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29074 (or 29069 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 16211666550 in words is "sixteen billion, two hundred eleven million, six hundred sixty-six thousand, five hundred fifty".