2165501263 has 2 divisors, whose sum is σ = 2165501264. Its totient is φ = 2165501262.

The previous prime is 2165501237. The next prime is 2165501279. The reversal of 2165501263 is 3621055612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2165501263 - 2⁹ = 2165500751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165501213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082750631 + 1082750632.

It is an arithmetic number, because the mean of its divisors is an integer number (1082750632).

Almost surely, 2^2165501263 is an apocalyptic number.

2165501263 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165501263 is an equidigital number, since it uses as much as digits as its factorization.

2165501263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 2165501263 is about 46534.9466852601. The cubic root of 2165501263 is about 1293.7573014345.

Adding to 2165501263 its reverse (3621055612), we get a palindrome (5786556875).

The spelling of 2165501263 in words is "two billion, one hundred sixty-five million, five hundred one thousand, two hundred sixty-three".