255555161 has 2 divisors, whose sum is σ = 255555162. Its totient is φ = 255555160.

The previous prime is 255555143. The next prime is 255555191. The reversal of 255555161 is 161555552.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192654400 + 62900761 = 13880^2 + 7931^2 .

It is a cyclic number.

It is not a de Polignac number, because 255555161 - 2¹⁰ = 255554137 is a prime.

It is not a weakly prime, because it can be changed into another prime (255555191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127777580 + 127777581.

It is an arithmetic number, because the mean of its divisors is an integer number (127777581).

Almost surely, 2^255555161 is an apocalyptic number.

It is an amenable number.

255555161 is a deficient number, since it is larger than the sum of its proper divisors (1).

255555161 is an equidigital number, since it uses as much as digits as its factorization.

255555161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37500, while the sum is 35.

The square root of 255555161 is about 15986.0927371262. The cubic root of 255555161 is about 634.5924274023.

The spelling of 255555161 in words is "two hundred fifty-five million, five hundred fifty-five thousand, one hundred sixty-one".