3860216561 has 2 divisors, whose sum is σ = 3860216562. Its totient is φ = 3860216560.

The previous prime is 3860216557. The next prime is 3860216609. The reversal of 3860216561 is 1656120683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2101672336 + 1758544225 = 45844^2 + 41935^2 .

It is a cyclic number.

It is not a de Polignac number, because 3860216561 - 2² = 3860216557 is a prime.

It is not a weakly prime, because it can be changed into another prime (3860216161) 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, 1930108280 + 1930108281.

It is an arithmetic number, because the mean of its divisors is an integer number (1930108281).

Almost surely, 2^3860216561 is an apocalyptic number.

It is an amenable number.

3860216561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3860216561 is an equidigital number, since it uses as much as digits as its factorization.

3860216561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 3860216561 is about 62130.6410799052. The cubic root of 3860216561 is about 1568.6903437132.

The spelling of 3860216561 in words is "three billion, eight hundred sixty million, two hundred sixteen thousand, five hundred sixty-one".