16561350 has 144 divisors (see below), whose sum is σ = 50778000. Its totient is φ = 3836160.

The previous prime is 16561339. The next prime is 16561361. The reversal of 16561350 is 5316561.

It is a happy number.

16561350 is a `hidden beast` number, since 1 + 656 + 1 + 3 + 5 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (16561339) and next prime (16561361).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 111076 + ... + 111224.

It is an arithmetic number, because the mean of its divisors is an integer number (352625).

Almost surely, 2^16561350 is an apocalyptic number.

16561350 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 16561350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25389000).

16561350 is an abundant number, since it is smaller than the sum of its proper divisors (34216650).

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

16561350 is a wasteful number, since it uses less digits than its factorization.

16561350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 16561350 is about 4069.5638586954. The cubic root of 16561350 is about 254.8973058225.

It can be divided in two parts, 165 and 61350, that multiplied together give a triangular number (10122750 = T₄₄₉₉).

The spelling of 16561350 in words is "sixteen million, five hundred sixty-one thousand, three hundred fifty".