81680506087 has 2 divisors, whose sum is σ = 81680506088. Its totient is φ = 81680506086.

The previous prime is 81680506031. The next prime is 81680506091. The reversal of 81680506087 is 78060508618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81680506087 - 2¹⁵ = 81680473319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81680506087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81680506007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40840253043 + 40840253044.

It is an arithmetic number, because the mean of its divisors is an integer number (40840253044).

Almost surely, 2^81680506087 is an apocalyptic number.

81680506087 is a deficient number, since it is larger than the sum of its proper divisors (1).

81680506087 is an equidigital number, since it uses as much as digits as its factorization.

81680506087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 81680506087 in words is "eighty-one billion, six hundred eighty million, five hundred six thousand, eighty-seven".