16550561000 has 128 divisors (see below), whose sum is σ = 40281040800. Its totient is φ = 6357299200.

The previous prime is 16550560889. The next prime is 16550561017. The reversal of 16550561000 is 16505561.

It can be written as a sum of positive squares in 16 ways, for example, as 166048996 + 16384512004 = 12886^2 + 128002^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 5711552 + ... + 5714448.

Almost surely, 2^16550561000 is an apocalyptic number.

16550561000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16550561000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20140520400).

16550561000 is an abundant number, since it is smaller than the sum of its proper divisors (23730479800).

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

16550561000 is a wasteful number, since it uses less digits than its factorization.

16550561000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3144 (or 3130 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The spelling of 16550561000 in words is "sixteen billion, five hundred fifty million, five hundred sixty-one thousand".