161597173788 has 36 divisors (see below), whose sum is σ = 408573311328. Its totient is φ = 53853649920.

The previous prime is 161597173781. The next prime is 161597173789. The reversal of 161597173788 is 887371795161.

161597173788 is a `hidden beast` number, since 1 + 6 + 1 + 597 + 1 + 7 + 37 + 8 + 8 = 666.

161597173788 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×161597173788² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161597173781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 339556 + ... + 662187.

It is an arithmetic number, because the mean of its divisors is an integer number (11349258648).

Almost surely, 2^161597173788 is an apocalyptic number.

161597173788 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161597173788 is an abundant number, since it is smaller than the sum of its proper divisors (246976137540).

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

161597173788 is a wasteful number, since it uses less digits than its factorization.

161597173788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006234 (or 1006229 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 63.

The spelling of 161597173788 in words is "one hundred sixty-one billion, five hundred ninety-seven million, one hundred seventy-three thousand, seven hundred eighty-eight".