263318817316 has 81 divisors (see below), whose sum is σ = 484576168881. Its totient is φ = 125199413664.

The previous prime is 263318817271. The next prime is 263318817317. The reversal of 263318817316 is 613718813362.

The square root of 263318817316 is 513146.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 189825776100 + 73493041216 = 435690^2 + 271096^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 263318817316.

It is not an unprimeable number, because it can be changed into a prime (263318817317) 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 in 26 ways as a sum of consecutive naturals, for example, 2556493321 + ... + 2556493423.

Almost surely, 2^263318817316 is an apocalyptic number.

263318817316 is the 513146-th square number.

It is an amenable number.

263318817316 is a deficient number, since it is larger than the sum of its proper divisors (221257351565).

263318817316 is an equidigital number, since it uses as much as digits as its factorization.

263318817316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410 (or 205 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

Multiplying 263318817316 by its sum of digits (49), we get a square (12902622048484 = 3592022²).

The spelling of 263318817316 in words is "two hundred sixty-three billion, three hundred eighteen million, eight hundred seventeen thousand, three hundred sixteen".