168215117436 has 144 divisors (see below), whose sum is σ = 463404090240. Its totient is φ = 51250268160.

The previous prime is 168215117401. The next prime is 168215117443. The reversal of 168215117436 is 634711512861.

168215117436 is a `hidden beast` number, since 1 + 68 + 2 + 1 + 511 + 74 + 3 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 168215117391 and 168215117400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2920710 + ... + 2977746.

It is an arithmetic number, because the mean of its divisors is an integer number (3218083960).

Almost surely, 2^168215117436 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 168215117436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231702045120).

168215117436 is an abundant number, since it is smaller than the sum of its proper divisors (295188972804).

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

168215117436 is a wasteful number, since it uses less digits than its factorization.

168215117436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57204 (or 57199 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The spelling of 168215117436 in words is "one hundred sixty-eight billion, two hundred fifteen million, one hundred seventeen thousand, four hundred thirty-six".