163943663 has 4 divisors (see below), whose sum is σ = 176554728. Its totient is φ = 151332600.

The previous prime is 163943629. The next prime is 163943669. The reversal of 163943663 is 366349361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 163943663 - 2⁶ = 163943599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163943663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163943669) 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, 6305513 + ... + 6305538.

It is an arithmetic number, because the mean of its divisors is an integer number (44138682).

Almost surely, 2^163943663 is an apocalyptic number.

163943663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

163943663 is a deficient number, since it is larger than the sum of its proper divisors (12611065).

163943663 is a wasteful number, since it uses less digits than its factorization.

163943663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12611064.

The product of its digits is 209952, while the sum is 41.

The square root of 163943663 is about 12804.0486956275. The cubic root of 163943663 is about 547.3076830568.

The spelling of 163943663 in words is "one hundred sixty-three million, nine hundred forty-three thousand, six hundred sixty-three".