161738327808 has 216 divisors, whose sum is σ = 470230016256. Its totient is φ = 53464320000.

The previous prime is 161738327801. The next prime is 161738327813. The reversal of 161738327808 is 808723837161.

161738327808 is a `hidden beast` number, since 161 + 7 + 383 + 27 + 80 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161738327801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177538873 + ... + 177539783.

It is an arithmetic number, because the mean of its divisors is an integer number (2176990816).

Almost surely, 2^161738327808 is an apocalyptic number.

161738327808 is a gapful number since it is divisible by the number (18) 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 161738327808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235115008128).

161738327808 is an abundant number, since it is smaller than the sum of its proper divisors (308491688448).

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

161738327808 is a wasteful number, since it uses less digits than its factorization.

161738327808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491 (or 1474 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 161738327808 in words is "one hundred sixty-one billion, seven hundred thirty-eight million, three hundred twenty-seven thousand, eight hundred eight".