81634654911744 has 180 divisors, whose sum is σ = 265548840590880. Its totient is φ = 24737774146560.

The previous prime is 81634654911709. The next prime is 81634654911767. The reversal of 81634654911744 is 44711945643618.

It is a happy number.

81634654911744 is a `hidden beast` number, since 8 + 1 + 6 + 3 + 4 + 6 + 549 + 11 + 74 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 178719924 + ... + 179176115.

It is an arithmetic number, because the mean of its divisors is an integer number (1475271336616).

Almost surely, 2^{81634654911744} is an apocalyptic number.

It is an amenable number.

81634654911744 is an abundant number, since it is smaller than the sum of its proper divisors (183914185679136).

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

81634654911744 is a wasteful number, since it uses less digits than its factorization.

81634654911744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357896078 (or 357896055 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The spelling of 81634654911744 in words is "eighty-one trillion, six hundred thirty-four billion, six hundred fifty-four million, nine hundred eleven thousand, seven hundred forty-four".