263421081844 has 12 divisors (see below), whose sum is σ = 463326929604. Its totient is φ = 131041959104.

The previous prime is 263421081827. The next prime is 263421081881. The reversal of 263421081844 is 448180124362.

It can be written as a sum of positive squares in 2 ways, for example, as 141488822500 + 121932259344 = 376150^2 + 349188^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 263421081844.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167144569 + ... + 167146144.

It is an arithmetic number, because the mean of its divisors is an integer number (38610577467).

Almost surely, 2^263421081844 is an apocalyptic number.

It is an amenable number.

263421081844 is a deficient number, since it is larger than the sum of its proper divisors (199905847760).

263421081844 is a wasteful number, since it uses less digits than its factorization.

263421081844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334290914 (or 334290912 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 43.

The spelling of 263421081844 in words is "two hundred sixty-three billion, four hundred twenty-one million, eighty-one thousand, eight hundred forty-four".