It is a happy number.
71791561239552 is a `hidden beast` number, since 7 + 1 + 7 + 9 + 1 + 5 + 612 + 3 + 9 + 5 + 5 + 2 = 666.
It is a tau number, because it is divible by the number of its divisors (1408).
It is a self number, because there is not a number n which added to its sum of digits gives 71791561239552.
Almost surely, 271791561239552 is an apocalyptic number.
71791561239552 is a gapful number since it is divisible by the number (72) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 71791561239552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136332165120000).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
71791561239552 is a wasteful number, since it uses less digits than its factorization.
71791561239552 is an odious number, because the sum of its binary digits is odd.
The spelling of 71791561239552 in words is "seventy-one trillion, seven hundred ninety-one billion, five hundred sixty-one million, two hundred thirty-nine thousand, five hundred fifty-two".