8161655544 has 48 divisors (see below), whose sum is σ = 25262268720. Its totient is φ = 2331901440.

The previous prime is 8161655543. The next prime is 8161655587. The reversal of 8161655544 is 4455561618.

8161655544 is a `hidden beast` number, since 81 + 6 + 16 + 5 + 554 + 4 = 666.

It is a super-2 number, since 2×8161655544² (a number of 21 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 8161655544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161655543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8096377 + ... + 8097384.

It is an arithmetic number, because the mean of its divisors is an integer number (526297265).

Almost surely, 2^8161655544 is an apocalyptic number.

8161655544 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

8161655544 is an abundant number, since it is smaller than the sum of its proper divisors (17100613176).

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

8161655544 is a wasteful number, since it uses less digits than its factorization.

8161655544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16193780 (or 16193773 counting only the distinct ones).

The product of its digits is 576000, while the sum is 45.

The square root of 8161655544 is about 90341.8814504104. The cubic root of 8161655544 is about 2013.3815625431.

The spelling of 8161655544 in words is "eight billion, one hundred sixty-one million, six hundred fifty-five thousand, five hundred forty-four".