161045221154 has 16 divisors (see below), whose sum is σ = 249652757760. Its totient is φ = 77833727280.

The previous prime is 161045221133. The next prime is 161045221157. The reversal of 161045221154 is 451122540161.

It is a happy number.

161045221154 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161045221154.

It is not an unprimeable number, because it can be changed into a prime (161045221157) 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 7 ways as a sum of consecutive naturals, for example, 1469684 + ... + 1575455.

It is an arithmetic number, because the mean of its divisors is an integer number (15603297360).

Almost surely, 2^161045221154 is an apocalyptic number.

161045221154 is a deficient number, since it is larger than the sum of its proper divisors (88607536606).

161045221154 is a wasteful number, since it uses less digits than its factorization.

161045221154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3046025.

The product of its (nonzero) digits is 9600, while the sum is 32.

The spelling of 161045221154 in words is "one hundred sixty-one billion, forty-five million, two hundred twenty-one thousand, one hundred fifty-four".