163553 has 8 divisors (see below), whose sum is σ = 184128. Its totient is φ = 144144.

The previous prime is 163543. The next prime is 163561. The reversal of 163553 is 355361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 163553 - 2¹⁰ = 162529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26 + ... + 572.

It is an arithmetic number, because the mean of its divisors is an integer number (23016).

2¹⁶³⁵⁵³ is an apocalyptic number.

163553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

163553 is a deficient number, since it is larger than the sum of its proper divisors (20575).

163553 is a wasteful number, since it uses less digits than its factorization.

163553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583.

The product of its digits is 1350, while the sum is 23.

The square root of 163553 is about 404.4168641390. The cubic root of 163553 is about 54.6872608969.

The spelling of 163553 in words is "one hundred sixty-three thousand, five hundred fifty-three".