163988378 has 4 divisors (see below), whose sum is σ = 245982570. Its totient is φ = 81994188.

The previous prime is 163988351. The next prime is 163988381. The reversal of 163988378 is 873889361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 873889361 = 16649 ⋅52489.

It can be written as a sum of positive squares in only one way, i.e., 136352329 + 27636049 = 11677^2 + 5257^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 40997093 + ... + 40997096.

Almost surely, 2^163988378 is an apocalyptic number.

163988378 is a deficient number, since it is larger than the sum of its proper divisors (81994192).

163988378 is an equidigital number, since it uses as much as digits as its factorization.

163988378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81994191.

The product of its digits is 1741824, while the sum is 53.

The square root of 163988378 is about 12805.7947039612. The cubic root of 163988378 is about 547.3574372183.

The spelling of 163988378 in words is "one hundred sixty-three million, nine hundred eighty-eight thousand, three hundred seventy-eight".