81281608479360 has 512 divisors, whose sum is σ = 289944724435200. Its totient is φ = 21519341715456.

The previous prime is 81281608479353. The next prime is 81281608479419. The reversal of 81281608479360 is 6397480618218.

81281608479360 is a `hidden beast` number, since 8 + 12 + 8 + 1 + 608 + 4 + 7 + 9 + 3 + 6 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2751842512 + ... + 2751872048.

Almost surely, 2^{81281608479360} is an apocalyptic number.

81281608479360 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 81281608479360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144972362217600).

81281608479360 is an abundant number, since it is smaller than the sum of its proper divisors (208663115955840).

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

81281608479360 is a wasteful number, since it uses less digits than its factorization.

81281608479360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30705 (or 30687 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 81281608479360 in words is "eighty-one trillion, two hundred eighty-one billion, six hundred eight million, four hundred seventy-nine thousand, three hundred sixty".