161541011251 has 2 divisors, whose sum is σ = 161541011252. Its totient is φ = 161541011250.

The previous prime is 161541011243. The next prime is 161541011273. The reversal of 161541011251 is 152110145161.

161541011251 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 is a cyclic number.

It is not a de Polignac number, because 161541011251 - 2³ = 161541011243 is a prime.

It is not a weakly prime, because it can be changed into another prime (161541011231) 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, 80770505625 + 80770505626.

It is an arithmetic number, because the mean of its divisors is an integer number (80770505626).

Almost surely, 2^161541011251 is an apocalyptic number.

161541011251 is a deficient number, since it is larger than the sum of its proper divisors (1).

161541011251 is an equidigital number, since it uses as much as digits as its factorization.

161541011251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 28.

The spelling of 161541011251 in words is "one hundred sixty-one billion, five hundred forty-one million, eleven thousand, two hundred fifty-one".