818863245504 has 140 divisors (see below), whose sum is σ = 2427977763288. Its totient is φ = 272885760000.

The previous prime is 818863245503. The next prime is 818863245517. The reversal of 818863245504 is 405542368818.

818863245504 is a `hidden beast` number, since 8 + 1 + 8 + 8 + 63 + 24 + 550 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (818863245503) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23211879 + ... + 23247129.

Almost surely, 2^818863245504 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 818863245504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1213988881644).

818863245504 is an abundant number, since it is smaller than the sum of its proper divisors (1609114517784).

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

818863245504 is a wasteful number, since it uses less digits than its factorization.

818863245504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39756 (or 39737 counting only the distinct ones).

The product of its (nonzero) digits is 7372800, while the sum is 54.

The spelling of 818863245504 in words is "eight hundred eighteen billion, eight hundred sixty-three million, two hundred forty-five thousand, five hundred four".