163687681644 has 24 divisors (see below), whose sum is σ = 382052267520. Its totient is φ = 54546225744.

The previous prime is 163687681621. The next prime is 163687681649. The reversal of 163687681644 is 446186786361.

163687681644 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (163687681649) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2000064 + ... + 2080295.

It is an arithmetic number, because the mean of its divisors is an integer number (15918844480).

Almost surely, 2^163687681644 is an apocalyptic number.

It is an amenable number.

163687681644 is an abundant number, since it is smaller than the sum of its proper divisors (218364585876).

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

163687681644 is a wasteful number, since it uses less digits than its factorization.

163687681644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4083709 (or 4083707 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 60.

The spelling of 163687681644 in words is "one hundred sixty-three billion, six hundred eighty-seven million, six hundred eighty-one thousand, six hundred forty-four".