171745138026 has 720 divisors, whose sum is σ = 529310871936. Its totient is φ = 40715136000.

The previous prime is 171745138013. The next prime is 171745138063. The reversal of 171745138026 is 620831547171.

171745138026 is a `hidden beast` number, since 171 + 7 + 451 + 3 + 8 + 0 + 26 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 359 ways as a sum of consecutive naturals, for example, 2418945571 + ... + 2418945641.

Almost surely, 2^171745138026 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171745138026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264655435968).

171745138026 is an abundant number, since it is smaller than the sum of its proper divisors (357565733910).

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

171745138026 is a wasteful number, since it uses less digits than its factorization.

171745138026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 171745138026 in words is "one hundred seventy-one billion, seven hundred forty-five million, one hundred thirty-eight thousand, twenty-six".