1643781120480 has 144 divisors (see below), whose sum is σ = 5817158880624. Its totient is φ = 438341621760.

The previous prime is 1643781120473. The next prime is 1643781120503. The reversal of 1643781120480 is 840211873461.

1643781120480 is a `hidden beast` number, since 1 + 6 + 43 + 7 + 8 + 1 + 120 + 480 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21100281 + ... + 21178040.

It is an arithmetic number, because the mean of its divisors is an integer number (40396936671).

Almost surely, 2^{1643781120480} is an apocalyptic number.

1643781120480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1643781120480 is an abundant number, since it is smaller than the sum of its proper divisors (4173377760144).

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

1643781120480 is an equidigital number, since it uses as much as digits as its factorization.

1643781120480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42278351 (or 42278331 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 1643781120480 in words is "one trillion, six hundred forty-three billion, seven hundred eighty-one million, one hundred twenty thousand, four hundred eighty".