1718721683872 has 48 divisors (see below), whose sum is σ = 3386513952360. Its totient is φ = 858655024128.

The previous prime is 1718721683843. The next prime is 1718721683897. The reversal of 1718721683872 is 2783861278171.

It can be written as a sum of positive squares in 4 ways, for example, as 1708865959696 + 9855724176 = 1307236^2 + 99276^2 .

It is a super-3 number, since 3×1718721683872³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1718721683872.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313804398 + ... + 313809874.

Almost surely, 2^{1718721683872} is an apocalyptic number.

It is an amenable number.

1718721683872 is a deficient number, since it is larger than the sum of its proper divisors (1667792268488).

1718721683872 is a wasteful number, since it uses less digits than its factorization.

1718721683872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11753 (or 11745 counting only the distinct ones).

The product of its digits is 12644352, while the sum is 61.

The spelling of 1718721683872 in words is "one trillion, seven hundred eighteen billion, seven hundred twenty-one million, six hundred eighty-three thousand, eight hundred seventy-two".