168784172786656 has 96 divisors (see below), whose sum is σ = 396363090009600. Its totient is φ = 69175800900096.

The previous prime is 168784172786599. The next prime is 168784172786657. The reversal of 168784172786656 is 656687271487861.

It is a self number, because there is not a number n which added to its sum of digits gives 168784172786656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168784172786657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19823670 + ... + 27028618.

It is an arithmetic number, because the mean of its divisors is an integer number (4128782187600).

Almost surely, 2^{168784172786656} is an apocalyptic number.

168784172786656 is a gapful number since it is divisible by the number (16) 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 168784172786656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198181545004800).

168784172786656 is an abundant number, since it is smaller than the sum of its proper divisors (227578917222944).

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

168784172786656 is a wasteful number, since it uses less digits than its factorization.

168784172786656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7209536 (or 7209528 counting only the distinct ones).

The product of its digits is 9103933440, while the sum is 82.

The spelling of 168784172786656 in words is "one hundred sixty-eight trillion, seven hundred eighty-four billion, one hundred seventy-two million, seven hundred eighty-six thousand, six hundred fifty-six".