161548391808 has 192 divisors, whose sum is σ = 471937190400. Its totient is φ = 53034568704.

The previous prime is 161548391801. The next prime is 161548391899. The reversal of 161548391808 is 808193845161.

It is a happy number.

161548391808 is a `hidden beast` number, since 1 + 6 + 1 + 548 + 3 + 91 + 8 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161548391801) 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, 40314541 + ... + 40318547.

It is an arithmetic number, because the mean of its divisors is an integer number (2458006200).

Almost surely, 2^161548391808 is an apocalyptic number.

161548391808 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 161548391808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235968595200).

161548391808 is an abundant number, since it is smaller than the sum of its proper divisors (310388798592).

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

161548391808 is a wasteful number, since it uses less digits than its factorization.

161548391808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4549 (or 4534 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The spelling of 161548391808 in words is "one hundred sixty-one billion, five hundred forty-eight million, three hundred ninety-one thousand, eight hundred eight".