2165783849 has 2 divisors, whose sum is σ = 2165783850. Its totient is φ = 2165783848.

The previous prime is 2165783839. The next prime is 2165783857. The reversal of 2165783849 is 9483875612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2158531600 + 7252249 = 46460^2 + 2693^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165783849 - 2⁸ = 2165783593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2165783849.

It is not a weakly prime, because it can be changed into another prime (2165783819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082891924 + 1082891925.

It is an arithmetic number, because the mean of its divisors is an integer number (1082891925).

Almost surely, 2^2165783849 is an apocalyptic number.

It is an amenable number.

2165783849 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165783849 is an equidigital number, since it uses as much as digits as its factorization.

2165783849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 53.

The square root of 2165783849 is about 46537.9828634633. The cubic root of 2165783849 is about 1293.8135750566.

The spelling of 2165783849 in words is "two billion, one hundred sixty-five million, seven hundred eighty-three thousand, eight hundred forty-nine".