18081650688 has 48 divisors (see below), whose sum is σ = 48205979640. Its totient is φ = 6027214848.

The previous prime is 18081650677. The next prime is 18081650689. The reversal of 18081650688 is 88605618081.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 18081650688.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081650689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1465345 + ... + 1477632.

Almost surely, 2^18081650688 is an apocalyptic number.

It is an amenable number.

18081650688 is an abundant number, since it is smaller than the sum of its proper divisors (30124328952).

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

18081650688 is an equidigital number, since it uses as much as digits as its factorization.

18081650688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943002 (or 2942982 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 51.

The spelling of 18081650688 in words is "eighteen billion, eighty-one million, six hundred fifty thousand, six hundred eighty-eight".