163453553 has 4 divisors (see below), whose sum is σ = 163534848. Its totient is φ = 163372260.

The previous prime is 163453519. The next prime is 163453579. The reversal of 163453553 is 355354361.

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: 355354361 = 71 ⋅5004991.

It is a cyclic number.

It is not a de Polignac number, because 163453553 - 2⁶ = 163453489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (163453513) 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, 37553 + ... + 41678.

It is an arithmetic number, because the mean of its divisors is an integer number (40883712).

Almost surely, 2^163453553 is an apocalyptic number.

It is an amenable number.

163453553 is a deficient number, since it is larger than the sum of its proper divisors (81295).

163453553 is an equidigital number, since it uses as much as digits as its factorization.

163453553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81294.

The product of its digits is 81000, while the sum is 35.

The square root of 163453553 is about 12784.8955021150. The cubic root of 163453553 is about 546.7617460953.

The spelling of 163453553 in words is "one hundred sixty-three million, four hundred fifty-three thousand, five hundred fifty-three".