4581566161 has 2 divisors, whose sum is σ = 4581566162. Its totient is φ = 4581566160.

The previous prime is 4581566137. The next prime is 4581566183. The reversal of 4581566161 is 1616651854.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4416931600 + 164634561 = 66460^2 + 12831^2 .

It is a cyclic number.

It is not a de Polignac number, because 4581566161 - 2⁹ = 4581565649 is a prime.

It is not a weakly prime, because it can be changed into another prime (4581566191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2290783080 + 2290783081.

It is an arithmetic number, because the mean of its divisors is an integer number (2290783081).

Almost surely, 2^4581566161 is an apocalyptic number.

It is an amenable number.

4581566161 is a deficient number, since it is larger than the sum of its proper divisors (1).

4581566161 is an equidigital number, since it uses as much as digits as its factorization.

4581566161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 43.

The square root of 4581566161 is about 67687.2673477073. The cubic root of 4581566161 is about 1660.8789752728.

The spelling of 4581566161 in words is "four billion, five hundred eighty-one million, five hundred sixty-six thousand, one hundred sixty-one".