161953243523 has 2 divisors, whose sum is σ = 161953243524. Its totient is φ = 161953243522.

The previous prime is 161953243471. The next prime is 161953243577. The reversal of 161953243523 is 325342359161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161953243523 - 2³² = 157658276227 is a prime.

It is not a weakly prime, because it can be changed into another prime (161953243583) 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 as a sum of consecutive naturals, namely, 80976621761 + 80976621762.

It is an arithmetic number, because the mean of its divisors is an integer number (80976621762).

Almost surely, 2^161953243523 is an apocalyptic number.

161953243523 is a deficient number, since it is larger than the sum of its proper divisors (1).

161953243523 is an equidigital number, since it uses as much as digits as its factorization.

161953243523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 44.

The spelling of 161953243523 in words is "one hundred sixty-one billion, nine hundred fifty-three million, two hundred forty-three thousand, five hundred twenty-three".