81812124834207 has 4 divisors (see below), whose sum is σ = 109082833112280. Its totient is φ = 54541416556136.

The previous prime is 81812124834173. The next prime is 81812124834227. The reversal of 81812124834207 is 70243842121818.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81812124834207 - 2¹⁴ = 81812124817823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81812124834207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81812124834227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13635354139032 + ... + 13635354139037.

It is an arithmetic number, because the mean of its divisors is an integer number (27270708278070).

Almost surely, 2^{81812124834207} is an apocalyptic number.

81812124834207 is a deficient number, since it is larger than the sum of its proper divisors (27270708278073).

81812124834207 is a wasteful number, since it uses less digits than its factorization.

81812124834207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27270708278072.

The product of its (nonzero) digits is 1376256, while the sum is 51.

The spelling of 81812124834207 in words is "eighty-one trillion, eight hundred twelve billion, one hundred twenty-four million, eight hundred thirty-four thousand, two hundred seven".