161541011273 has 2 divisors, whose sum is σ = 161541011274. Its totient is φ = 161541011272.

The previous prime is 161541011251. The next prime is 161541011341. The reversal of 161541011273 is 372110145161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155139091129 + 6401920144 = 393877^2 + 80012^2 .

It is a cyclic number.

It is not a de Polignac number, because 161541011273 - 2⁶ = 161541011209 is a prime.

It is not a weakly prime, because it can be changed into another prime (161541011243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80770505636 + 80770505637.

It is an arithmetic number, because the mean of its divisors is an integer number (80770505637).

Almost surely, 2^161541011273 is an apocalyptic number.

It is an amenable number.

161541011273 is a deficient number, since it is larger than the sum of its proper divisors (1).

161541011273 is an equidigital number, since it uses as much as digits as its factorization.

161541011273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 161541011273 in words is "one hundred sixty-one billion, five hundred forty-one million, eleven thousand, two hundred seventy-three".