163665678 has 64 divisors (see below), whose sum is σ = 371589120. Its totient is φ = 47608800.

The previous prime is 163665659. The next prime is 163665679. The reversal of 163665678 is 876566361.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163665679) 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 31 ways as a sum of consecutive naturals, for example, 341443 + ... + 341921.

It is an arithmetic number, because the mean of its divisors is an integer number (5806080).

Almost surely, 2^163665678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163665678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185794560).

163665678 is an abundant number, since it is smaller than the sum of its proper divisors (207923442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163665678 is a wasteful number, since it uses less digits than its factorization.

163665678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693.

The product of its digits is 1088640, while the sum is 48.

The square root of 163665678 is about 12793.1887346353. The cubic root of 163665678 is about 546.9981673841.

The spelling of 163665678 in words is "one hundred sixty-three million, six hundred sixty-five thousand, six hundred seventy-eight".