81812124834206 has 16 divisors (see below), whose sum is σ = 132169247190288. Its totient is φ = 37756242408000.

The previous prime is 81812124834173. The next prime is 81812124834227. The reversal of 81812124834206 is 60243842121818.

It is a super-2 number, since 2×81812124834206² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

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, 133013240 + ... + 133626891.

It is an arithmetic number, because the mean of its divisors is an integer number (8260577949393).

Almost surely, 2^{81812124834206} is an apocalyptic number.

81812124834206 is a deficient number, since it is larger than the sum of its proper divisors (50357122356082).

81812124834206 is a wasteful number, since it uses less digits than its factorization.

81812124834206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266651947.

The product of its (nonzero) digits is 1179648, while the sum is 50.

The spelling of 81812124834206 in words is "eighty-one trillion, eight hundred twelve billion, one hundred twenty-four million, eight hundred thirty-four thousand, two hundred six".