163809991656 has 128 divisors (see below), whose sum is σ = 465825600000. Its totient is φ = 53989296768.

The previous prime is 163809991621. The next prime is 163809991663. The reversal of 163809991656 is 656199908361.

163809991656 is a `hidden beast` number, since 1 + 6 + 380 + 9 + 99 + 165 + 6 = 666.

163809991656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 163809991593 and 163809991602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1504545 + ... + 1609743.

It is an arithmetic number, because the mean of its divisors is an integer number (3639262500).

Almost surely, 2^163809991656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163809991656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232912800000).

163809991656 is an abundant number, since it is smaller than the sum of its proper divisors (302015608344).

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

163809991656 is an equidigital number, since it uses as much as digits as its factorization.

163809991656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105315 (or 105293 counting only the distinct ones).

The product of its (nonzero) digits is 18895680, while the sum is 63.

The spelling of 163809991656 in words is "one hundred sixty-three billion, eight hundred nine million, nine hundred ninety-one thousand, six hundred fifty-six".