168681738722040 has 128 divisors (see below), whose sum is σ = 562276389484800. Its totient is φ = 44981482826880.

The previous prime is 168681738722009. The next prime is 168681738722149. The reversal of 168681738722040 is 40227837186861.

It is a happy number.

168681738722040 is a `hidden beast` number, since 16 + 8 + 6 + 8 + 17 + 387 + 220 + 4 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 182624175 + ... + 183545505.

It is an arithmetic number, because the mean of its divisors is an integer number (4392784292850).

Almost surely, 2^{168681738722040} is an apocalyptic number.

168681738722040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168681738722040 is an abundant number, since it is smaller than the sum of its proper divisors (393594650762760).

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

168681738722040 is a wasteful number, since it uses less digits than its factorization.

168681738722040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090874 (or 1090864 counting only the distinct ones).

The product of its (nonzero) digits is 43352064, while the sum is 63.

The spelling of 168681738722040 in words is "one hundred sixty-eight trillion, six hundred eighty-one billion, seven hundred thirty-eight million, seven hundred twenty-two thousand, forty".