81560494081 has 8 divisors (see below), whose sum is σ = 88981624224. Its totient is φ = 74140453920.

The previous prime is 81560494033. The next prime is 81560494121. The reversal of 81560494081 is 18049406518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81560494081 - 2¹⁷ = 81560363009 is a prime.

It is a super-2 number, since 2×81560494081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81560494181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111916 + ... + 419101.

It is an arithmetic number, because the mean of its divisors is an integer number (11122703028).

Almost surely, 2^81560494081 is an apocalyptic number.

It is an amenable number.

81560494081 is a deficient number, since it is larger than the sum of its proper divisors (7421130143).

81560494081 is a wasteful number, since it uses less digits than its factorization.

81560494081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544991.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 81560494081 in words is "eighty-one billion, five hundred sixty million, four hundred ninety-four thousand, eighty-one".