2165731702249 has 2 divisors, whose sum is σ = 2165731702250. Its totient is φ = 2165731702248.

The previous prime is 2165731702219. The next prime is 2165731702261. The reversal of 2165731702249 is 9422071375612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1285593145600 + 880138556649 = 1133840^2 + 938157^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165731702249 - 2¹³ = 2165731694057 is a prime.

It is a super-2 number, since 2×2165731702249² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2165731702219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082865851124 + 1082865851125.

It is an arithmetic number, because the mean of its divisors is an integer number (1082865851125).

Almost surely, 2^{2165731702249} is an apocalyptic number.

It is an amenable number.

2165731702249 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165731702249 is an equidigital number, since it uses as much as digits as its factorization.

2165731702249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 2165731702249 in words is "two trillion, one hundred sixty-five billion, seven hundred thirty-one million, seven hundred two thousand, two hundred forty-nine".