263440812217 has 8 divisors (see below), whose sum is σ = 287460863712. Its totient is φ = 239432575200.

The previous prime is 263440812191. The next prime is 263440812221. The reversal of 263440812217 is 712218044362.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 263440812217 - 2³⁵ = 229081073849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 263440812217.

It is not an unprimeable number, because it can be changed into a prime (263440812617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2906959 + ... + 2996212.

It is an arithmetic number, because the mean of its divisors is an integer number (35932607964).

Almost surely, 2^263440812217 is an apocalyptic number.

It is an amenable number.

263440812217 is a deficient number, since it is larger than the sum of its proper divisors (24020051495).

263440812217 is a wasteful number, since it uses less digits than its factorization.

263440812217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5907239.

The product of its (nonzero) digits is 129024, while the sum is 40.

Adding to 263440812217 its reverse (712218044362), we get a palindrome (975658856579).

The spelling of 263440812217 in words is "two hundred sixty-three billion, four hundred forty million, eight hundred twelve thousand, two hundred seventeen".