108189031638 has 16 divisors (see below), whose sum is σ = 219425642496. Its totient is φ = 35555080680.

The previous prime is 108189031637. The next prime is 108189031661. The reversal of 108189031638 is 836130981801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108189031637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126982006 + ... + 126982857.

It is an arithmetic number, because the mean of its divisors is an integer number (13714102656).

Almost surely, 2^108189031638 is an apocalyptic number.

108189031638 is an abundant number, since it is smaller than the sum of its proper divisors (111236610858).

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

108189031638 is a wasteful number, since it uses less digits than its factorization.

108189031638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253964939.

The product of its (nonzero) digits is 248832, while the sum is 48.

The spelling of 108189031638 in words is "one hundred eight billion, one hundred eighty-nine million, thirty-one thousand, six hundred thirty-eight".