81568845566678 has 16 divisors (see below), whose sum is σ = 125660614020144. Its totient is φ = 39681983008800.

The previous prime is 81568845566629. The next prime is 81568845566699. The reversal of 81568845566678 is 87666554886518.

It is a junction number, because it is equal to n+sod(n) for n = 81568845566596 and 81568845566605.

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, 17718401 + ... + 21842147.

It is an arithmetic number, because the mean of its divisors is an integer number (7853788376259).

Almost surely, 2^{81568845566678} is an apocalyptic number.

81568845566678 is a deficient number, since it is larger than the sum of its proper divisors (44091768453466).

81568845566678 is a wasteful number, since it uses less digits than its factorization.

81568845566678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4391087.

The product of its digits is 18579456000, while the sum is 83.

The spelling of 81568845566678 in words is "eighty-one trillion, five hundred sixty-eight billion, eight hundred forty-five million, five hundred sixty-six thousand, six hundred seventy-eight".