1265601163 has 2 divisors, whose sum is σ = 1265601164. Its totient is φ = 1265601162.

The previous prime is 1265601149. The next prime is 1265601173. The reversal of 1265601163 is 3611065621.

It is a strong prime.

It is an emirp because it is prime and its reverse (3611065621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1265601163 - 2⁵ = 1265601131 is a prime.

It is not a weakly prime, because it can be changed into another prime (1265601173) 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, 632800581 + 632800582.

It is an arithmetic number, because the mean of its divisors is an integer number (632800582).

Almost surely, 2^1265601163 is an apocalyptic number.

1265601163 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265601163 is an equidigital number, since it uses as much as digits as its factorization.

1265601163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1265601163 is about 35575.2886565942. The cubic root of 1265601163 is about 1081.6803867935.

Adding to 1265601163 its reverse (3611065621), we get a palindrome (4876666784).

The spelling of 1265601163 in words is "one billion, two hundred sixty-five million, six hundred one thousand, one hundred sixty-three".