20171616216 has 64 divisors (see below), whose sum is σ = 52667435520. Its totient is φ = 6425928960.

The previous prime is 20171616187. The next prime is 20171616221. The reversal of 20171616216 is 61261617102.

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, 643221 + ... + 673851.

It is an arithmetic number, because the mean of its divisors is an integer number (822928680).

Almost surely, 2^20171616216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20171616216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26333717760).

20171616216 is an abundant number, since it is smaller than the sum of its proper divisors (32495819304).

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

20171616216 is a wasteful number, since it uses less digits than its factorization.

20171616216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31856 (or 31852 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The spelling of 20171616216 in words is "twenty billion, one hundred seventy-one million, six hundred sixteen thousand, two hundred sixteen".