163644231611388 has 384 divisors, whose sum is σ = 432804772528128. Its totient is φ = 47696947200000.

The previous prime is 163644231611261. The next prime is 163644231611453. The reversal of 163644231611388 is 883116132446361.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 51444271158 + ... + 51444274338.

It is an arithmetic number, because the mean of its divisors is an integer number (1127095761792).

Almost surely, 2^{163644231611388} 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 163644231611388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216402386264064).

163644231611388 is an abundant number, since it is smaller than the sum of its proper divisors (269160540916740).

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

163644231611388 is a wasteful number, since it uses less digits than its factorization.

163644231611388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3897 (or 3895 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 57.

The spelling of 163644231611388 in words is "one hundred sixty-three trillion, six hundred forty-four billion, two hundred thirty-one million, six hundred eleven thousand, three hundred eighty-eight".