4165561061 has 2 divisors, whose sum is σ = 4165561062. Its totient is φ = 4165561060.

The previous prime is 4165561019. The next prime is 4165561139. The reversal of 4165561061 is 1601655614.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3729544900 + 436016161 = 61070^2 + 20881^2 .

It is a cyclic number.

It is not a de Polignac number, because 4165561061 - 2¹⁰ = 4165560037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4165569061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2082780530 + 2082780531.

It is an arithmetic number, because the mean of its divisors is an integer number (2082780531).

Almost surely, 2^4165561061 is an apocalyptic number.

It is an amenable number.

4165561061 is a deficient number, since it is larger than the sum of its proper divisors (1).

4165561061 is an equidigital number, since it uses as much as digits as its factorization.

4165561061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 4165561061 is about 64541.1578839426. The cubic root of 4165561061 is about 1609.0066350143.

The spelling of 4165561061 in words is "four billion, one hundred sixty-five million, five hundred sixty-one thousand, sixty-one".