2061565871 has 2 divisors, whose sum is σ = 2061565872. Its totient is φ = 2061565870.

The previous prime is 2061565867. The next prime is 2061565903. The reversal of 2061565871 is 1785651602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2061565871 - 2² = 2061565867 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2061565811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1030782935 + 1030782936.

It is an arithmetic number, because the mean of its divisors is an integer number (1030782936).

Almost surely, 2^2061565871 is an apocalyptic number.

2061565871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2061565871 is an equidigital number, since it uses as much as digits as its factorization.

2061565871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 2061565871 is about 45404.4697249070. The cubic root of 2061565871 is about 1272.7186416083.

The spelling of 2061565871 in words is "two billion, sixty-one million, five hundred sixty-five thousand, eight hundred seventy-one".