16166561550 has 96 divisors (see below), whose sum is σ = 41149866240. Its totient is φ = 4198924800.

The previous prime is 16166561491. The next prime is 16166561561. The reversal of 16166561550 is 5516566161.

16166561550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×16166561550² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 874806 + ... + 893094.

It is an arithmetic number, because the mean of its divisors is an integer number (428644440).

Almost surely, 2^16166561550 is an apocalyptic number.

16166561550 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 16166561550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20574933120).

16166561550 is an abundant number, since it is smaller than the sum of its proper divisors (24983304690).

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

16166561550 is a wasteful number, since it uses less digits than its factorization.

16166561550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18458 (or 18453 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 16166561550 in words is "sixteen billion, one hundred sixty-six million, five hundred sixty-one thousand, five hundred fifty".