161853653573 has 2 divisors, whose sum is σ = 161853653574. Its totient is φ = 161853653572.

The previous prime is 161853653539. The next prime is 161853653609. The reversal of 161853653573 is 375356358161.

161853653573 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136443061924 + 25410591649 = 369382^2 + 159407^2 .

It is a cyclic number.

It is not a de Polignac number, because 161853653573 - 2⁶ = 161853653509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161853653513) 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 as a sum of consecutive naturals, namely, 80926826786 + 80926826787.

It is an arithmetic number, because the mean of its divisors is an integer number (80926826787).

Almost surely, 2^161853653573 is an apocalyptic number.

It is an amenable number.

161853653573 is a deficient number, since it is larger than the sum of its proper divisors (1).

161853653573 is an equidigital number, since it uses as much as digits as its factorization.

161853653573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804000, while the sum is 53.

The spelling of 161853653573 in words is "one hundred sixty-one billion, eight hundred fifty-three million, six hundred fifty-three thousand, five hundred seventy-three".