81610560960 has 56 divisors (see below), whose sum is σ = 259113534096. Its totient is φ = 21762816000.

The previous prime is 81610560959. The next prime is 81610561009. The reversal of 81610560960 is 6906501618.

It is a happy number.

It is a super-2 number, since 2×81610560960² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 42504541 + ... + 42506460.

Almost surely, 2^81610560960 is an apocalyptic number.

81610560960 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81610560960 is an abundant number, since it is smaller than the sum of its proper divisors (177502973136).

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

81610560960 is a wasteful number, since it uses less digits than its factorization.

81610560960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85011021 (or 85011011 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 81610560960 in words is "eighty-one billion, six hundred ten million, five hundred sixty thousand, nine hundred sixty".