81106744077468 has 36 divisors (see below), whose sum is σ = 205149338922528. Its totient is φ = 27018502640640.

The previous prime is 81106744077451. The next prime is 81106744077473. The reversal of 81106744077468 is 86477044760118.

It is a happy number.

81106744077468 is a `hidden beast` number, since 8 + 1 + 1 + 0 + 67 + 4 + 40 + 77 + 468 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 711555493 + ... + 711669468.

It is an arithmetic number, because the mean of its divisors is an integer number (5698592747848).

Almost surely, 2^{81106744077468} is an apocalyptic number.

It is an amenable number.

81106744077468 is an abundant number, since it is smaller than the sum of its proper divisors (124042594845060).

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

81106744077468 is a wasteful number, since it uses less digits than its factorization.

81106744077468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423226554 (or 1423226549 counting only the distinct ones).

The product of its (nonzero) digits is 50577408, while the sum is 63.

The spelling of 81106744077468 in words is "eighty-one trillion, one hundred six billion, seven hundred forty-four million, seventy-seven thousand, four hundred sixty-eight".