1689726126172 has 54 divisors (see below), whose sum is σ = 3402122463096. Its totient is φ = 719342653680.

The previous prime is 1689726126161. The next prime is 1689726126233. The reversal of 1689726126172 is 2716216279861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1148691397 + ... + 1148692867.

Almost surely, 2^{1689726126172} is an apocalyptic number.

It is an amenable number.

1689726126172 is an abundant number, since it is smaller than the sum of its proper divisors (1712396336924).

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

1689726126172 is an frugal number, since it uses more digits than its factorization.

1689726126172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287 (or 1647 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 58.

The spelling of 1689726126172 in words is "one trillion, six hundred eighty-nine billion, seven hundred twenty-six million, one hundred twenty-six thousand, one hundred seventy-two".