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BaseRepresentation
bin10010100000000101100110…
…101001101000100100000000
3101200002212212200021000001110
4102200011212221220210000
541131131002132102200
6445020450012003320
723065531264525500
oct2240054651504400
9350085780230043
1081369877612800
1123a21853671057
12916203b460540
1336531b9c2262a
1416144747b7a00
1596193d346b50
hex4a0166a68900

81369877612800 has 648 divisors, whose sum is σ = 312662638789536. Its totient is φ = 18582026158080.

The previous prime is 81369877612787. The next prime is 81369877612883. The reversal of 81369877612800 is 821677896318.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1056479892 + ... + 1056556908.

Almost surely, 281369877612800 is an apocalyptic number.

81369877612800 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 81369877612800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156331319394768).

81369877612800 is an abundant number, since it is smaller than the sum of its proper divisors (231292761176736).

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

81369877612800 is a wasteful number, since it uses less digits than its factorization.

81369877612800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78183 (or 78157 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 66.

The spelling of 81369877612800 in words is "eighty-one trillion, three hundred sixty-nine billion, eight hundred seventy-seven million, six hundred twelve thousand, eight hundred".