16553538 has 32 divisors (see below), whose sum is σ = 37646400. Its totient is φ = 5388768.

The previous prime is 16553533. The next prime is 16553539. The reversal of 16553538 is 83535561.

16553538 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16553531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1243 + ... + 5886.

It is an arithmetic number, because the mean of its divisors is an integer number (1176450).

Almost surely, 2^16553538 is an apocalyptic number.

16553538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16553538 is an abundant number, since it is smaller than the sum of its proper divisors (21092862).

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

16553538 is a wasteful number, since it uses less digits than its factorization.

16553538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7183 (or 7177 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 16553538 is about 4068.6039374704. The cubic root of 16553538 is about 254.8572211086.

The spelling of 16553538 in words is "sixteen million, five hundred fifty-three thousand, five hundred thirty-eight".