1641544107840 has 1400 divisors, whose sum is σ = 7339686732840. Its totient is φ = 346177069056.

The previous prime is 1641544107839. The next prime is 1641544107893. The reversal of 1641544107840 is 487014451461.

1641544107840 is a `hidden beast` number, since 1 + 6 + 4 + 154 + 410 + 7 + 84 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 342983579904 + 1298560527936 = 585648^2 + 1139544^2 .

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 199 ways as a sum of consecutive naturals, for example, 809039946 + ... + 809041974.

Almost surely, 2^{1641544107840} is an apocalyptic number.

1641544107840 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 1641544107840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3669843366420).

1641544107840 is an abundant number, since it is smaller than the sum of its proper divisors (5698142625000).

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

1641544107840 is an equidigital number, since it uses as much as digits as its factorization.

1641544107840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099 (or 2059 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 1641544107840 in words is "one trillion, six hundred forty-one billion, five hundred forty-four million, one hundred seven thousand, eight hundred forty".