81706323488656 has 40 divisors (see below), whose sum is σ = 159146768964800. Its totient is φ = 40636306364544.

The previous prime is 81706323488641. The next prime is 81706323488681. The reversal of 81706323488656 is 65688432360718.

It is a junction number, because it is equal to n+sod(n) for n = 81706323488591 and 81706323488600.

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, 7549915 + ... + 14846341.

It is an arithmetic number, because the mean of its divisors is an integer number (3978669224120).

Almost surely, 2^{81706323488656} is an apocalyptic number.

It is an amenable number.

81706323488656 is a deficient number, since it is larger than the sum of its proper divisors (77440445476144).

81706323488656 is a wasteful number, since it uses less digits than its factorization.

81706323488656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7300151 (or 7300145 counting only the distinct ones).

The product of its (nonzero) digits is 278691840, while the sum is 67.

The spelling of 81706323488656 in words is "eighty-one trillion, seven hundred six billion, three hundred twenty-three million, four hundred eighty-eight thousand, six hundred fifty-six".