161364545161 has 2 divisors, whose sum is σ = 161364545162. Its totient is φ = 161364545160.

The previous prime is 161364545131. The next prime is 161364545171. The reversal of 161364545161 is 161545463161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148576327936 + 12788217225 = 385456^2 + 113085^2 .

It is a cyclic number.

It is not a de Polignac number, because 161364545161 - 2³¹ = 159217061513 is a prime.

It is not a weakly prime, because it can be changed into another prime (161364545131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80682272580 + 80682272581.

It is an arithmetic number, because the mean of its divisors is an integer number (80682272581).

Almost surely, 2^161364545161 is an apocalyptic number.

It is an amenable number.

161364545161 is a deficient number, since it is larger than the sum of its proper divisors (1).

161364545161 is an equidigital number, since it uses as much as digits as its factorization.

161364545161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 43.

The spelling of 161364545161 in words is "one hundred sixty-one billion, three hundred sixty-four million, five hundred forty-five thousand, one hundred sixty-one".