168172537038228 has 72 divisors (see below), whose sum is σ = 425462179484160. Its totient is φ = 56010128077440.

The previous prime is 168172537038203. The next prime is 168172537038353. The reversal of 168172537038228 is 822830735271861.

It is a happy number.

168172537038228 is a `hidden beast` number, since 1 + 6 + 8 + 1 + 7 + 2 + 5 + 370 + 38 + 228 = 666.

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 23 ways as a sum of consecutive naturals, for example, 697809613 + ... + 698050571.

It is an arithmetic number, because the mean of its divisors is an integer number (5909196937280).

Almost surely, 2^{168172537038228} is an apocalyptic number.

168172537038228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

168172537038228 is an abundant number, since it is smaller than the sum of its proper divisors (257289642445932).

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

168172537038228 is a wasteful number, since it uses less digits than its factorization.

168172537038228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257277 (or 257272 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 63.

The spelling of 168172537038228 in words is "one hundred sixty-eight trillion, one hundred seventy-two billion, five hundred thirty-seven million, thirty-eight thousand, two hundred twenty-eight".