81844718683776 has 64 divisors (see below), whose sum is σ = 218374922277120. Its totient is φ = 27159233974272.

The previous prime is 81844718683769. The next prime is 81844718683799. The reversal of 81844718683776 is 67738681744818.

It is a tau number, because it is divible by the number of its divisors (64).

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, 477800665 + ... + 477971928.

It is an arithmetic number, because the mean of its divisors is an integer number (3412108160580).

Almost surely, 2^{81844718683776} is an apocalyptic number.

It is an amenable number.

81844718683776 is an abundant number, since it is smaller than the sum of its proper divisors (136530203593344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81844718683776 is a wasteful number, since it uses less digits than its factorization.

81844718683776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955772833 (or 955772821 counting only the distinct ones).

The product of its digits is 2427715584, while the sum is 78.

The spelling of 81844718683776 in words is "eighty-one trillion, eight hundred forty-four billion, seven hundred eighteen million, six hundred eighty-three thousand, seven hundred seventy-six".