1643317489212 has 24 divisors (see below), whose sum is σ = 4382179971456. Its totient is φ = 469519282608.

The previous prime is 1643317489147. The next prime is 1643317489213. The reversal of 1643317489212 is 2129847133461.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643317489213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9781651638 + ... + 9781651805.

It is an arithmetic number, because the mean of its divisors is an integer number (182590832144).

Almost surely, 2^{1643317489212} is an apocalyptic number.

1643317489212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1643317489212 is an abundant number, since it is smaller than the sum of its proper divisors (2738862482244).

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

1643317489212 is a wasteful number, since it uses less digits than its factorization.

1643317489212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19563303457 (or 19563303455 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 51.

The spelling of 1643317489212 in words is "one trillion, six hundred forty-three billion, three hundred seventeen million, four hundred eighty-nine thousand, two hundred twelve".