1643315330340 has 72 divisors (see below), whose sum is σ = 4984849691640. Its totient is φ = 438206298624.

The previous prime is 1643315330323. The next prime is 1643315330369. The reversal of 1643315330340 is 430335133461.

1643315330340 is a `hidden beast` number, since 1 + 6 + 4 + 3 + 315 + 330 + 3 + 4 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 62708173056 + 1580607157284 = 250416^2 + 1257222^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1643315330295 and 1643315330304.

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, 8968522 + ... + 9149918.

It is an arithmetic number, because the mean of its divisors is an integer number (69234023495).

Almost surely, 2^{1643315330340} is an apocalyptic number.

1643315330340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1643315330340 is an abundant number, since it is smaller than the sum of its proper divisors (3341534361300).

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

1643315330340 is a wasteful number, since it uses less digits than its factorization.

1643315330340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231741 (or 231736 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 36.

The spelling of 1643315330340 in words is "one trillion, six hundred forty-three billion, three hundred fifteen million, three hundred thirty thousand, three hundred forty".