18339416550 has 768 divisors, whose sum is σ = 66962380800. Its totient is φ = 3627970560.

The previous prime is 18339416509. The next prime is 18339416567. The reversal of 18339416550 is 5561493381.

18339416550 is a `hidden beast` number, since 1 + 8 + 3 + 3 + 94 + 1 + 6 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 18339416496 and 18339416505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 189066102 + ... + 189066198.

It is an arithmetic number, because the mean of its divisors is an integer number (87190600).

Almost surely, 2^18339416550 is an apocalyptic number.

18339416550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18339416550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33481190400).

18339416550 is an abundant number, since it is smaller than the sum of its proper divisors (48622964250).

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

18339416550 is a wasteful number, since it uses less digits than its factorization.

18339416550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 18339416550 in words is "eighteen billion, three hundred thirty-nine million, four hundred sixteen thousand, five hundred fifty".