2545647161 has 2 divisors, whose sum is σ = 2545647162. Its totient is φ = 2545647160.

The previous prime is 2545647067. The next prime is 2545647191. The reversal of 2545647161 is 1617465452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2512515625 + 33131536 = 50125^2 + 5756^2 .

It is a cyclic number.

It is not a de Polignac number, because 2545647161 - 2¹⁰ = 2545646137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2545647191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272823580 + 1272823581.

It is an arithmetic number, because the mean of its divisors is an integer number (1272823581).

Almost surely, 2^2545647161 is an apocalyptic number.

It is an amenable number.

2545647161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2545647161 is an equidigital number, since it uses as much as digits as its factorization.

2545647161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 41.

The square root of 2545647161 is about 50454.4067550100. The cubic root of 2545647161 is about 1365.4194010612.

The spelling of 2545647161 in words is "two billion, five hundred forty-five million, six hundred forty-seven thousand, one hundred sixty-one".