18383683550 has 48 divisors (see below), whose sum is σ = 37373000832. Its totient is φ = 6697651200.

The previous prime is 18383683543. The next prime is 18383683561. The reversal of 18383683550 is 5538638381.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 322487 + ... + 375186.

It is an arithmetic number, because the mean of its divisors is an integer number (778604184).

Almost surely, 2^18383683550 is an apocalyptic number.

18383683550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18383683550 is an abundant number, since it is smaller than the sum of its proper divisors (18989317282).

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

18383683550 is a wasteful number, since it uses less digits than its factorization.

18383683550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697733 (or 697728 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 50.

The spelling of 18383683550 in words is "eighteen billion, three hundred eighty-three million, six hundred eighty-three thousand, five hundred fifty".