81594850463280 has 800 divisors, whose sum is σ = 353481295749120. Its totient is φ = 16946969610240.

The previous prime is 81594850463279. The next prime is 81594850463327. The reversal of 81594850463280 is 8236405849518.

81594850463280 is a `hidden beast` number, since 8 + 1 + 5 + 9 + 48 + 50 + 463 + 2 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1117134922 + ... + 1117207958.

Almost surely, 2^{81594850463280} is an apocalyptic number.

81594850463280 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 81594850463280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176740647874560).

81594850463280 is an abundant number, since it is smaller than the sum of its proper divisors (271886445285840).

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

81594850463280 is a wasteful number, since it uses less digits than its factorization.

81594850463280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75319 (or 75304 counting only the distinct ones).

The product of its (nonzero) digits is 66355200, while the sum is 63.

The spelling of 81594850463280 in words is "eighty-one trillion, five hundred ninety-four billion, eight hundred fifty million, four hundred sixty-three thousand, two hundred eighty".