163908863 has 4 divisors (see below), whose sum is σ = 163934808. Its totient is φ = 163882920.

The previous prime is 163908851. The next prime is 163908887. The reversal of 163908863 is 368809361.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 368809361 = 19 ⋅19411019.

It is a cyclic number.

It is not a de Polignac number, because 163908863 - 2⁴ = 163908847 is a prime.

It is a super-2 number, since 2×163908863² = 53732230739905538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163908803) 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, 3353 + ... + 18413.

It is an arithmetic number, because the mean of its divisors is an integer number (40983702).

Almost surely, 2^163908863 is an apocalyptic number.

163908863 is a deficient number, since it is larger than the sum of its proper divisors (25945).

163908863 is a wasteful number, since it uses less digits than its factorization.

163908863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25944.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 163908863 is about 12802.6896783449. The cubic root of 163908863 is about 547.2689550068.

The spelling of 163908863 in words is "one hundred sixty-three million, nine hundred eight thousand, eight hundred sixty-three".