161968666050 has 72 divisors (see below), whose sum is σ = 441116944164. Its totient is φ = 42599969280.

The previous prime is 161968666043. The next prime is 161968666073. The reversal of 161968666050 is 50666869161.

161968666050 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 22652357049 + 139316309001 = 150507^2 + 373251^2 .

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 2432427 + ... + 2498126.

Almost surely, 2^161968666050 is an apocalyptic number.

161968666050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161968666050 is an abundant number, since it is smaller than the sum of its proper divisors (279148278114).

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

161968666050 is a wasteful number, since it uses less digits than its factorization.

161968666050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4930644 (or 4930636 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 161968666050 in words is "one hundred sixty-one billion, nine hundred sixty-eight million, six hundred sixty-six thousand, fifty".