161688485888 has 32 divisors (see below), whose sum is σ = 323372102970. Its totient is φ = 80844226560.

The previous prime is 161688485867. The next prime is 161688485971. The reversal of 161688485888 is 888584886161.

It can be written as a sum of positive squares in only one way, i.e., 138836721664 + 22851764224 = 372608^2 + 151168^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×161688485888² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2434403 + ... + 2499938.

Almost surely, 2^161688485888 is an apocalyptic number.

It is an amenable number.

161688485888 is a deficient number, since it is larger than the sum of its proper divisors (161683617082).

161688485888 is an frugal number, since it uses more digits than its factorization.

161688485888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4934371 (or 4934343 counting only the distinct ones).

The product of its digits is 188743680, while the sum is 71.

The spelling of 161688485888 in words is "one hundred sixty-one billion, six hundred eighty-eight million, four hundred eighty-five thousand, eight hundred eighty-eight".