81756065718 has 16 divisors (see below), whose sum is σ = 181680146160. Its totient is φ = 27252021888.

The previous prime is 81756065683. The next prime is 81756065737.

81756065718 is a `hidden beast` number, since 8 + 1 + 7 + 5 + 60 + 6 + 571 + 8 = 666.

81756065718 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 1514001217 = 81756065718 / (8 + 1 + 7 + 5 + 6 + 0 + 6 + 5 + 7 + 1 + 8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 757000555 + ... + 757000662.

It is an arithmetic number, because the mean of its divisors is an integer number (11355009135).

Almost surely, 2^81756065718 is an apocalyptic number.

81756065718 is an abundant number, since it is smaller than the sum of its proper divisors (99924080442).

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

81756065718 is a wasteful number, since it uses less digits than its factorization.

81756065718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514001228 (or 1514001222 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 54.

The spelling of 81756065718 in words is "eighty-one billion, seven hundred fifty-six million, sixty-five thousand, seven hundred eighteen".