161163919008 has 36 divisors (see below), whose sum is σ = 458309895498. Its totient is φ = 53721306240.

The previous prime is 161163919001. The next prime is 161163919141. The reversal of 161163919008 is 800919361161.

161163919008 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 639 + 1 + 9 + 0 + 0 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 155100493584 + 6063425424 = 393828^2 + 77868^2 .

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

It is not an unprimeable number, because it can be changed into a prime (161163919001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 279798183 + ... + 279798758.

Almost surely, 2^161163919008 is an apocalyptic number.

161163919008 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161163919008 is an abundant number, since it is smaller than the sum of its proper divisors (297145976490).

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

161163919008 is a wasteful number, since it uses less digits than its factorization.

161163919008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559596957 (or 559596946 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The spelling of 161163919008 in words is "one hundred sixty-one billion, one hundred sixty-three million, nine hundred nineteen thousand, eight".