81717622768106 has 16 divisors (see below), whose sum is σ = 135573103887144. Its totient is φ = 36696479246784.

The previous prime is 81717622768097. The next prime is 81717622768121. The reversal of 81717622768106 is 60186722671718.

81717622768106 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 81093536988025 + 624085780081 = 9005195^2 + 789991^2 .

It is a super-2 number, since 2×81717622768106² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42472775945 + ... + 42472777868.

Almost surely, 2^{81717622768106} is an apocalyptic number.

81717622768106 is a deficient number, since it is larger than the sum of its proper divisors (53855481119038).

81717622768106 is a wasteful number, since it uses less digits than its factorization.

81717622768106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84945553865.

The product of its (nonzero) digits is 18966528, while the sum is 62.

The spelling of 81717622768106 in words is "eighty-one trillion, seven hundred seventeen billion, six hundred twenty-two million, seven hundred sixty-eight thousand, one hundred six".