81685763085982 has 16 divisors (see below), whose sum is σ = 135858884657904. Its totient is φ = 36521205552000.

The previous prime is 81685763085923. The next prime is 81685763086033. The reversal of 81685763085982 is 28958036758618.

It is a junction number, because it is equal to n+sod(n) for n = 81685763085899 and 81685763085908.

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, 30434336619 + ... + 30434339302.

It is an arithmetic number, because the mean of its divisors is an integer number (8491180291119).

Almost surely, 2^{81685763085982} is an apocalyptic number.

81685763085982 is a deficient number, since it is larger than the sum of its proper divisors (54173121571922).

81685763085982 is a wasteful number, since it uses less digits than its factorization.

81685763085982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60868675995.

The product of its (nonzero) digits is 1393459200, while the sum is 76.

The spelling of 81685763085982 in words is "eighty-one trillion, six hundred eighty-five billion, seven hundred sixty-three million, eighty-five thousand, nine hundred eighty-two".