1643536332340 has 96 divisors (see below), whose sum is σ = 4007893800960. Its totient is φ = 554459140224.

The previous prime is 1643536332331. The next prime is 1643536332359. The reversal of 1643536332340 is 432336353461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8221291 + ... + 8418829.

It is an arithmetic number, because the mean of its divisors is an integer number (41748893760).

Almost surely, 2^{1643536332340} is an apocalyptic number.

1643536332340 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 1643536332340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2003946900480).

1643536332340 is an abundant number, since it is smaller than the sum of its proper divisors (2364357468620).

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

1643536332340 is a wasteful number, since it uses less digits than its factorization.

1643536332340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198509 (or 198507 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 43.

The spelling of 1643536332340 in words is "one trillion, six hundred forty-three billion, five hundred thirty-six million, three hundred thirty-two thousand, three hundred forty".