81775435808726 has 24 divisors (see below), whose sum is σ = 139477339229760. Its totient is φ = 35888905994480.

The previous prime is 81775435808659. The next prime is 81775435808741. The reversal of 81775435808726 is 62780853457718.

It is a self number, because there is not a number n which added to its sum of digits gives 81775435808726.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5826114086 + ... + 5826128121.

It is an arithmetic number, because the mean of its divisors is an integer number (5811555801240).

Almost surely, 2^{81775435808726} is an apocalyptic number.

81775435808726 is a deficient number, since it is larger than the sum of its proper divisors (57701903421034).

81775435808726 is a wasteful number, since it uses less digits than its factorization.

81775435808726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11652242260 (or 11652242249 counting only the distinct ones).

The product of its (nonzero) digits is 632217600, while the sum is 71.

The spelling of 81775435808726 in words is "eighty-one trillion, seven hundred seventy-five billion, four hundred thirty-five million, eight hundred eight thousand, seven hundred twenty-six".