81847539525086 has 16 divisors (see below), whose sum is σ = 123650064718848. Its totient is φ = 40631670639000.

The previous prime is 81847539525049. The next prime is 81847539525151. The reversal of 81847539525086 is 68052593574818.

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, 204638240 + ... + 205037811.

It is an arithmetic number, because the mean of its divisors is an integer number (7728129044928).

It is a 1-persistent number, because it is pandigital, but 2⋅81847539525086 = 163695079050172 is not.

Almost surely, 2^{81847539525086} is an apocalyptic number.

81847539525086 is a deficient number, since it is larger than the sum of its proper divisors (41802525193762).

81847539525086 is a wasteful number, since it uses less digits than its factorization.

81847539525086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409676767.

The product of its (nonzero) digits is 580608000, while the sum is 71.

The spelling of 81847539525086 in words is "eighty-one trillion, eight hundred forty-seven billion, five hundred thirty-nine million, five hundred twenty-five thousand, eighty-six".