16561950 has 48 divisors (see below), whose sum is σ = 42091056. Its totient is φ = 4307200.

The previous prime is 16561913. The next prime is 16561969. The reversal of 16561950 is 5916561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4804 + ... + 7496.

It is an arithmetic number, because the mean of its divisors is an integer number (876897).

Almost surely, 2^16561950 is an apocalyptic number.

16561950 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 16561950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21045528).

16561950 is an abundant number, since it is smaller than the sum of its proper divisors (25529106).

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

16561950 is a wasteful number, since it uses less digits than its factorization.

16561950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749 (or 2744 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 16561950 is about 4069.6375760011. The cubic root of 16561950 is about 254.9003840042.

The spelling of 16561950 in words is "sixteen million, five hundred sixty-one thousand, nine hundred fifty".