172171806432 has 96 divisors (see below), whose sum is σ = 463400499744. Its totient is φ = 55939276800.

The previous prime is 172171806419. The next prime is 172171806493. The reversal of 172171806432 is 234608171271.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4376932 + ... + 4416092.

It is an arithmetic number, because the mean of its divisors is an integer number (4827088539).

Almost surely, 2^172171806432 is an apocalyptic number.

172171806432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172171806432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231700249872).

172171806432 is an abundant number, since it is smaller than the sum of its proper divisors (291228693312).

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

172171806432 is a wasteful number, since it uses less digits than its factorization.

172171806432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40332 (or 40324 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The spelling of 172171806432 in words is "one hundred seventy-two billion, one hundred seventy-one million, eight hundred six thousand, four hundred thirty-two".