163387553 has 4 divisors (see below), whose sum is σ = 186728640. Its totient is φ = 140046468.

The previous prime is 163387541. The next prime is 163387559. The reversal of 163387553 is 355783361.

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.

It is a cyclic number.

It is not a de Polignac number, because 163387553 - 2⁶ = 163387489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163387553.

It is not an unprimeable number, because it can be changed into a prime (163387559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11670533 + ... + 11670546.

It is an arithmetic number, because the mean of its divisors is an integer number (46682160).

Almost surely, 2^163387553 is an apocalyptic number.

It is an amenable number.

163387553 is a deficient number, since it is larger than the sum of its proper divisors (23341087).

163387553 is an equidigital number, since it uses as much as digits as its factorization.

163387553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23341086.

The product of its digits is 226800, while the sum is 41.

The square root of 163387553 is about 12782.3140706212. The cubic root of 163387553 is about 546.6881448944.

The spelling of 163387553 in words is "one hundred sixty-three million, three hundred eighty-seven thousand, five hundred fifty-three".