1999496378880 has 3840 divisors, whose sum is σ = 10209546547200. Its totient is φ = 363334533120.

The previous prime is 1999496378849. The next prime is 1999496378881. The reversal of 1999496378880 is 888736949991.

1999496378880 is a `hidden beast` number, since 1 + 9 + 99 + 496 + 37 + 8 + 8 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (3840).

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a self number, because there is not a number n which added to its sum of digits gives 1999496378880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999496378881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 105236651511 + ... + 105236651529.

It is an arithmetic number, because the mean of its divisors is an integer number (2658736080).

Almost surely, 2^{1999496378880} is an apocalyptic number.

1999496378880 is a gapful number since it is divisible by the number (10) 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 1999496378880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5104773273600).

1999496378880 is an abundant number, since it is smaller than the sum of its proper divisors (8210050168320).

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

1999496378880 is an equidigital number, since it uses as much as digits as its factorization.

1999496378880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 1693052928, while the sum is 81.

The spelling of 1999496378880 in words is "one trillion, nine hundred ninety-nine billion, four hundred ninety-six million, three hundred seventy-eight thousand, eight hundred eighty".