161543646875 has 24 divisors (see below), whose sum is σ = 217448738640. Its totient is φ = 119293740000.

The previous prime is 161543646841. The next prime is 161543646877. The reversal of 161543646875 is 578646345161.

161543646875 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161543646875 - 2⁸ = 161543646619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161543646875.

It is not an unprimeable number, because it can be changed into a prime (161543646877) 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 23 ways as a sum of consecutive naturals, for example, 1947605 + ... + 2028854.

It is an arithmetic number, because the mean of its divisors is an integer number (9060364110).

Almost surely, 2^161543646875 is an apocalyptic number.

161543646875 is a deficient number, since it is larger than the sum of its proper divisors (55905091765).

161543646875 is an frugal number, since it uses more digits than its factorization.

161543646875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3976497 (or 3976477 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 56.

The spelling of 161543646875 in words is "one hundred sixty-one billion, five hundred forty-three million, six hundred forty-six thousand, eight hundred seventy-five".