18644865250 has 32 divisors (see below), whose sum is σ = 38076210432. Its totient is φ = 6779950000.

The previous prime is 18644865247. The next prime is 18644865293. The reversal of 18644865250 is 5256844681.

It is a junction number, because it is equal to n+sod(n) for n = 18644865194 and 18644865203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3387226 + ... + 3392725.

It is an arithmetic number, because the mean of its divisors is an integer number (1189881576).

Almost surely, 2^18644865250 is an apocalyptic number.

18644865250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18644865250 is an abundant number, since it is smaller than the sum of its proper divisors (19431345182).

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

18644865250 is a wasteful number, since it uses less digits than its factorization.

18644865250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6779979 (or 6779969 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 49.

The spelling of 18644865250 in words is "eighteen billion, six hundred forty-four million, eight hundred sixty-five thousand, two hundred fifty".