18311550268 has 24 divisors (see below), whose sum is σ = 35903239344. Its totient is φ = 8098473600.

The previous prime is 18311550251. The next prime is 18311550269. The reversal of 18311550268 is 86205511381.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18311550268.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18311550269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5622313 + ... + 5625568.

It is an arithmetic number, because the mean of its divisors is an integer number (1495968306).

Almost surely, 2^18311550268 is an apocalyptic number.

It is an amenable number.

18311550268 is a deficient number, since it is larger than the sum of its proper divisors (17591689076).

18311550268 is a wasteful number, since it uses less digits than its factorization.

18311550268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11247933 (or 11247931 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The spelling of 18311550268 in words is "eighteen billion, three hundred eleven million, five hundred fifty thousand, two hundred sixty-eight".