18450449898738 has 256 divisors, whose sum is σ = 44943719546880. Its totient is φ = 4974257433600.

The previous prime is 18450449898691. The next prime is 18450449898739. The reversal of 18450449898738 is 83789894405481.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is not an unprimeable number, because it can be changed into a prime (18450449898739) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2524343028 + ... + 2524350336.

It is an arithmetic number, because the mean of its divisors is an integer number (175561404480).

Almost surely, 2^{18450449898738} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18450449898738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22471859773440).

18450449898738 is an abundant number, since it is smaller than the sum of its proper divisors (26493269648142).

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

18450449898738 is a wasteful number, since it uses less digits than its factorization.

18450449898738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8113.

The product of its (nonzero) digits is 2229534720, while the sum is 78.

The spelling of 18450449898738 in words is "eighteen trillion, four hundred fifty billion, four hundred forty-nine million, eight hundred ninety-eight thousand, seven hundred thirty-eight".