171980021852 has 24 divisors (see below), whose sum is σ = 304377771936. Its totient is φ = 85016752128.

The previous prime is 171980021833. The next prime is 171980021867. The reversal of 171980021852 is 258120089171.

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, 155948 + ... + 606860.

It is an arithmetic number, because the mean of its divisors is an integer number (12682407164).

Almost surely, 2^171980021852 is an apocalyptic number.

It is an amenable number.

171980021852 is a deficient number, since it is larger than the sum of its proper divisors (132397750084).

171980021852 is a wasteful number, since it uses less digits than its factorization.

171980021852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451997 (or 451995 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 44.

The spelling of 171980021852 in words is "one hundred seventy-one billion, nine hundred eighty million, twenty-one thousand, eight hundred fifty-two".