9818091281880 has 640 divisors, whose sum is σ = 37972471680000. Its totient is φ = 2228794444800.

The previous prime is 9818091281857. The next prime is 9818091281899. The reversal of 9818091281880 is 881821908189.

9818091281880 is a `hidden beast` number, since 98 + 180 + 91 + 281 + 8 + 8 + 0 = 666.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 2974276230 + ... + 2974279530.

It is an arithmetic number, because the mean of its divisors is an integer number (59331987000).

Almost surely, 2^{9818091281880} is an apocalyptic number.

9818091281880 is a gapful number since it is divisible by the number (90) 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 9818091281880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18986235840000).

9818091281880 is an abundant number, since it is smaller than the sum of its proper divisors (28154380398120).

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

9818091281880 is a wasteful number, since it uses less digits than its factorization.

9818091281880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4189 (or 4176 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 63.

The spelling of 9818091281880 in words is "nine trillion, eight hundred eighteen billion, ninety-one million, two hundred eighty-one thousand, eight hundred eighty".