163541553444 has 84 divisors (see below), whose sum is σ = 430992337104. Its totient is φ = 54273482352.

The previous prime is 163541553397. The next prime is 163541553451. The reversal of 163541553444 is 444355145361.

163541553444 is a `hidden beast` number, since 1 + 6 + 3 + 54 + 1 + 553 + 4 + 44 = 666.

It is a super-2 number, since 2×163541553444² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 163541553444.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 538399 + ... + 785465.

It is an arithmetic number, because the mean of its divisors is an integer number (5130861156).

Almost surely, 2^163541553444 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 163541553444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215496168552).

163541553444 is an abundant number, since it is smaller than the sum of its proper divisors (267450783660).

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

163541553444 is a wasteful number, since it uses less digits than its factorization.

163541553444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247316 (or 247299 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 45.

The spelling of 163541553444 in words is "one hundred sixty-three billion, five hundred forty-one million, five hundred fifty-three thousand, four hundred forty-four".