1643317489172 has 24 divisors (see below), whose sum is σ = 2878984364256. Its totient is φ = 820750700448.

The previous prime is 1643317489147. The next prime is 1643317489213. The reversal of 1643317489172 is 2719847133461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61573343 + ... + 61600025.

It is an arithmetic number, because the mean of its divisors is an integer number (119957681844).

Almost surely, 2^{1643317489172} is an apocalyptic number.

It is an amenable number.

1643317489172 is a deficient number, since it is larger than the sum of its proper divisors (1235666875084).

1643317489172 is a wasteful number, since it uses less digits than its factorization.

1643317489172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43127 (or 43125 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 56.

The spelling of 1643317489172 in words is "one trillion, six hundred forty-three billion, three hundred seventeen million, four hundred eighty-nine thousand, one hundred seventy-two".