161545323545401 has 2 divisors, whose sum is σ = 161545323545402. Its totient is φ = 161545323545400.

The previous prime is 161545323545339. The next prime is 161545323545527. The reversal of 161545323545401 is 104545323545161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161512072387600 + 33251157801 = 12708740^2 + 182349^2 .

It is a cyclic number.

It is not a de Polignac number, because 161545323545401 - 2¹³ = 161545323537209 is a prime.

It is not a weakly prime, because it can be changed into another prime (161545323546401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80772661772700 + 80772661772701.

It is an arithmetic number, because the mean of its divisors is an integer number (80772661772701).

Almost surely, 2^{161545323545401} is an apocalyptic number.

It is an amenable number.

161545323545401 is a deficient number, since it is larger than the sum of its proper divisors (1).

161545323545401 is an equidigital number, since it uses as much as digits as its factorization.

161545323545401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320000, while the sum is 49.

The spelling of 161545323545401 in words is "one hundred sixty-one trillion, five hundred forty-five billion, three hundred twenty-three million, five hundred forty-five thousand, four hundred one".