18243918550 has 96 divisors (see below), whose sum is σ = 41599837440. Its totient is φ = 5857526400.

The previous prime is 18243918533. The next prime is 18243918599. The reversal of 18243918550 is 5581934281.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 18243918550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108981 + ... + 219919.

It is an arithmetic number, because the mean of its divisors is an integer number (433331640).

Almost surely, 2^18243918550 is an apocalyptic number.

18243918550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18243918550 is an abundant number, since it is smaller than the sum of its proper divisors (23355918890).

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

18243918550 is a wasteful number, since it uses less digits than its factorization.

18243918550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110998 (or 110993 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 18243918550 in words is "eighteen billion, two hundred forty-three million, nine hundred eighteen thousand, five hundred fifty".