81858040705255 has 8 divisors (see below), whose sum is σ = 104007863484432. Its totient is φ = 61634289472128.

The previous prime is 81858040705139. The next prime is 81858040705291. The reversal of 81858040705255 is 55250704085818.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81858040705255 - 2⁹ = 81858040704743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81858040705255.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481517886417 + ... + 481517886586.

It is an arithmetic number, because the mean of its divisors is an integer number (13000982935554).

Almost surely, 2^{81858040705255} is an apocalyptic number.

81858040705255 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81858040705255 is a deficient number, since it is larger than the sum of its proper divisors (22149822779177).

81858040705255 is a wasteful number, since it uses less digits than its factorization.

81858040705255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963035773025.

The product of its (nonzero) digits is 17920000, while the sum is 58.

The spelling of 81858040705255 in words is "eighty-one trillion, eight hundred fifty-eight billion, forty million, seven hundred five thousand, two hundred fifty-five".