81560074816 has 28 divisors (see below), whose sum is σ = 176559027120. Its totient is φ = 37072760960.

The previous prime is 81560074811. The next prime is 81560074819. The reversal of 81560074816 is 61847006518.

It is not an unprimeable number, because it can be changed into a prime (81560074811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57925486 + ... + 57926893.

It is an arithmetic number, because the mean of its divisors is an integer number (6305679540).

Almost surely, 2^81560074816 is an apocalyptic number.

It is an amenable number.

81560074816 is an abundant number, since it is smaller than the sum of its proper divisors (94998952304).

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

81560074816 is a wasteful number, since it uses less digits than its factorization.

81560074816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115852402 (or 115852392 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 81560074816 in words is "eighty-one billion, five hundred sixty million, seventy-four thousand, eight hundred sixteen".