161375575577 has 2 divisors, whose sum is σ = 161375575578. Its totient is φ = 161375575576.

The previous prime is 161375575531. The next prime is 161375575597. The reversal of 161375575577 is 775575573161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144568008841 + 16807566736 = 380221^2 + 129644^2 .

It is a cyclic number.

It is not a de Polignac number, because 161375575577 - 2¹⁴ = 161375559193 is a prime.

It is not a weakly prime, because it can be changed into another prime (161375575597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80687787788 + 80687787789.

It is an arithmetic number, because the mean of its divisors is an integer number (80687787789).

Almost surely, 2^161375575577 is an apocalyptic number.

It is an amenable number.

161375575577 is a deficient number, since it is larger than the sum of its proper divisors (1).

161375575577 is an equidigital number, since it uses as much as digits as its factorization.

161375575577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27011250, while the sum is 59.

The spelling of 161375575577 in words is "one hundred sixty-one billion, three hundred seventy-five million, five hundred seventy-five thousand, five hundred seventy-seven".