263313630636 has 144 divisors (see below), whose sum is σ = 719740127232. Its totient is φ = 74704291200.

The previous prime is 263313630571. The next prime is 263313630703. The reversal of 263313630636 is 636036313362.

263313630636 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74233815 + ... + 74237361.

It is an arithmetic number, because the mean of its divisors is an integer number (4998195328).

Almost surely, 2^263313630636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 263313630636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (359870063616).

263313630636 is an abundant number, since it is smaller than the sum of its proper divisors (456426496596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

263313630636 is a wasteful number, since it uses less digits than its factorization.

263313630636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4420 (or 4411 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 42.

Adding to 263313630636 its reverse (636036313362), we get a palindrome (899349943998).

The spelling of 263313630636 in words is "two hundred sixty-three billion, three hundred thirteen million, six hundred thirty thousand, six hundred thirty-six".