161688801688 has 16 divisors (see below), whose sum is σ = 303625161360. Its totient is φ = 80722092000.

The previous prime is 161688801683. The next prime is 161688801691. The reversal of 161688801688 is 886108886161.

It is a super-2 number, since 2×161688801688² (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 (161688801683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15282988 + ... + 15293563.

It is an arithmetic number, because the mean of its divisors is an integer number (18976572585).

Almost surely, 2^161688801688 is an apocalyptic number.

It is an amenable number.

161688801688 is a deficient number, since it is larger than the sum of its proper divisors (141936359672).

161688801688 is a wasteful number, since it uses less digits than its factorization.

161688801688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30577218 (or 30577214 counting only the distinct ones).

The product of its (nonzero) digits is 7077888, while the sum is 61.

The spelling of 161688801688 in words is "one hundred sixty-one billion, six hundred eighty-eight million, eight hundred one thousand, six hundred eighty-eight".