81776205658016 has 48 divisors (see below), whose sum is σ = 161499595965120. Its totient is φ = 40760460195840.

The previous prime is 81776205658013. The next prime is 81776205658027. The reversal of 81776205658016 is 61085650267718.

It is a self number, because there is not a number n which added to its sum of digits gives 81776205658016.

It is not an unprimeable number, because it can be changed into a prime (81776205658013) 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 in 7 ways as a sum of consecutive naturals, for example, 105948560 + ... + 106717616.

It is an arithmetic number, because the mean of its divisors is an integer number (3364574915940).

Almost surely, 2^{81776205658016} is an apocalyptic number.

It is an amenable number.

81776205658016 is a deficient number, since it is larger than the sum of its proper divisors (79723390307104).

81776205658016 is a wasteful number, since it uses less digits than its factorization.

81776205658016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779437 (or 779429 counting only the distinct ones).

The product of its (nonzero) digits is 33868800, while the sum is 62.

The spelling of 81776205658016 in words is "eighty-one trillion, seven hundred seventy-six billion, two hundred five million, six hundred fifty-eight thousand, sixteen".