163450553 has 4 divisors (see below), whose sum is σ = 186800640. Its totient is φ = 140100468.

The previous prime is 163450549. The next prime is 163450561. The reversal of 163450553 is 355054361.

163450553 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 355054361 = 79 ⋅4494359.

It is a cyclic number.

It is not a de Polignac number, because 163450553 - 2² = 163450549 is a prime.

It is a super-3 number, since 3×163450553³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163450543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11675033 + ... + 11675046.

It is an arithmetic number, because the mean of its divisors is an integer number (46700160).

Almost surely, 2^163450553 is an apocalyptic number.

It is an amenable number.

163450553 is a deficient number, since it is larger than the sum of its proper divisors (23350087).

163450553 is an equidigital number, since it uses as much as digits as its factorization.

163450553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23350086.

The product of its (nonzero) digits is 27000, while the sum is 32.

The square root of 163450553 is about 12784.7781756275. The cubic root of 163450553 is about 546.7584010160.

The spelling of 163450553 in words is "one hundred sixty-three million, four hundred fifty thousand, five hundred fifty-three".