16553520 has 120 divisors (see below), whose sum is σ = 56465136. Its totient is φ = 4345344.

The previous prime is 16553507. The next prime is 16553527. The reversal of 16553520 is 2535561.

16553520 is a `hidden beast` number, since 1 + 655 + 3 + 5 + 2 + 0 = 666.

16553520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16553527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59622 + ... + 59898.

Almost surely, 2^16553520 is an apocalyptic number.

16553520 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 16553520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28232568).

16553520 is an abundant number, since it is smaller than the sum of its proper divisors (39911616).

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

16553520 is a wasteful number, since it uses less digits than its factorization.

16553520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 16553520 is about 4068.6017254089. The cubic root of 16553520 is about 254.8571287330.

It can be divided in two parts, 16 and 553520, that added together give a square (553536 = 744²).

The spelling of 16553520 in words is "sixteen million, five hundred fifty-three thousand, five hundred twenty".