168513825656 has 64 divisors (see below), whose sum is σ = 361482048000. Its totient is φ = 72898531200.

The previous prime is 168513825653. The next prime is 168513825671. The reversal of 168513825656 is 656528315861.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168513825653) 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, 193586 + ... + 611966.

It is an arithmetic number, because the mean of its divisors is an integer number (5648157000).

Almost surely, 2^168513825656 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 168513825656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180741024000).

168513825656 is an abundant number, since it is smaller than the sum of its proper divisors (192968222344).

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

168513825656 is a wasteful number, since it uses less digits than its factorization.

168513825656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418620 (or 418616 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 56.

The spelling of 168513825656 in words is "one hundred sixty-eight billion, five hundred thirteen million, eight hundred twenty-five thousand, six hundred fifty-six".