1265433563 has 2 divisors, whose sum is σ = 1265433564. Its totient is φ = 1265433562.

The previous prime is 1265433511. The next prime is 1265433581. The reversal of 1265433563 is 3653345621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1265433563 is a prime.

It is not a weakly prime, because it can be changed into another prime (1265433503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632716781 + 632716782.

It is an arithmetic number, because the mean of its divisors is an integer number (632716782).

Almost surely, 2^1265433563 is an apocalyptic number.

1265433563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265433563 is an equidigital number, since it uses as much as digits as its factorization.

1265433563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 38.

The square root of 1265433563 is about 35572.9330109284. The cubic root of 1265433563 is about 1081.6326367226.

The spelling of 1265433563 in words is "one billion, two hundred sixty-five million, four hundred thirty-three thousand, five hundred sixty-three".