82861981809105 has 16 divisors (see below), whose sum is σ = 140377945653504. Its totient is φ = 41593465378560.

The previous prime is 82861981809077. The next prime is 82861981809119. The reversal of 82861981809105 is 50190818916828.

It is not a de Polignac number, because 82861981809105 - 2¹⁵ = 82861981776337 is a prime.

It is a super-2 number, since 2×82861981809105² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162474473881 + ... + 162474474390.

It is an arithmetic number, because the mean of its divisors is an integer number (8773621603344).

Almost surely, 2^{82861981809105} is an apocalyptic number.

82861981809105 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

82861981809105 is a deficient number, since it is larger than the sum of its proper divisors (57515963844399).

82861981809105 is a wasteful number, since it uses less digits than its factorization.

82861981809105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324948948296.

The product of its (nonzero) digits is 19906560, while the sum is 66.

The spelling of 82861981809105 in words is "eighty-two trillion, eight hundred sixty-one billion, nine hundred eighty-one million, eight hundred nine thousand, one hundred five".