18763363808 has 72 divisors (see below), whose sum is σ = 43676126424. Its totient is φ = 7909574400.

The previous prime is 18763363727. The next prime is 18763363819. The reversal of 18763363808 is 80836336781.

It is a self number, because there is not a number n which added to its sum of digits gives 18763363808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2438 + ... + 193733.

It is an arithmetic number, because the mean of its divisors is an integer number (606612867).

Almost surely, 2^18763363808 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 18763363808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21838063212).

18763363808 is an abundant number, since it is smaller than the sum of its proper divisors (24912762616).

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

18763363808 is a wasteful number, since it uses less digits than its factorization.

18763363808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196256 (or 196241 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 18763363808 in words is "eighteen billion, seven hundred sixty-three million, three hundred sixty-three thousand, eight hundred eight".