81560494080 has 1120 divisors, whose sum is σ = 330369355008. Its totient is φ = 19110297600.

The previous prime is 81560494033. The next prime is 81560494121. The reversal of 81560494080 is 8049406518.

81560494080 is a `hidden beast` number, since 8 + 1 + 560 + 4 + 9 + 4 + 0 + 80 = 666.

It is a super-2 number, since 2×81560494080² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1337057250 + ... + 1337057310.

Almost surely, 2^81560494080 is an apocalyptic number.

81560494080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81560494080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165184677504).

81560494080 is an abundant number, since it is smaller than the sum of its proper divisors (248808860928).

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

81560494080 is a wasteful number, since it uses less digits than its factorization.

81560494080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 81560494080 in words is "eighty-one billion, five hundred sixty million, four hundred ninety-four thousand, eighty".