263135563 has 4 divisors (see below), whose sum is σ = 268734240. Its totient is φ = 257536888.

The previous prime is 263135539. The next prime is 263135567. The reversal of 263135563 is 365531362.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 263135563 - 2¹⁷ = 263004491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263135567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2799268 + ... + 2799361.

It is an arithmetic number, because the mean of its divisors is an integer number (67183560).

Almost surely, 2^263135563 is an apocalyptic number.

263135563 is a deficient number, since it is larger than the sum of its proper divisors (5598677).

263135563 is an equidigital number, since it uses as much as digits as its factorization.

263135563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5598676.

The product of its digits is 48600, while the sum is 34.

The square root of 263135563 is about 16221.4537881165. The cubic root of 263135563 is about 640.8059207525.

The spelling of 263135563 in words is "two hundred sixty-three million, one hundred thirty-five thousand, five hundred sixty-three".