1643941930680 has 576 divisors, whose sum is σ = 6285399120000. Its totient is φ = 371532607488.

The previous prime is 1643941930607. The next prime is 1643941930703. The reversal of 1643941930680 is 860391493461.

1643941930680 is a `hidden beast` number, since 1 + 6 + 4 + 394 + 193 + 0 + 68 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 628176732 + ... + 628179348.

It is an arithmetic number, because the mean of its divisors is an integer number (10912151250).

Almost surely, 2^{1643941930680} is an apocalyptic number.

1643941930680 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 1643941930680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3142699560000).

1643941930680 is an abundant number, since it is smaller than the sum of its proper divisors (4641457189320).

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

1643941930680 is a wasteful number, since it uses less digits than its factorization.

1643941930680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3036 (or 3022 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 1643941930680 in words is "one trillion, six hundred forty-three billion, nine hundred forty-one million, nine hundred thirty thousand, six hundred eighty".