18397374450 has 384 divisors, whose sum is σ = 58460258304. Its totient is φ = 3725568000.

The previous prime is 18397374427. The next prime is 18397374529. The reversal of 18397374450 is 5447379381.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18397374393 and 18397374402.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 39734919 + ... + 39735381.

It is an arithmetic number, because the mean of its divisors is an integer number (152240256).

Almost surely, 2^18397374450 is an apocalyptic number.

18397374450 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 18397374450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29230129152).

18397374450 is an abundant number, since it is smaller than the sum of its proper divisors (40062883854).

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

18397374450 is a wasteful number, since it uses less digits than its factorization.

18397374450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610 (or 605 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 51.

The spelling of 18397374450 in words is "eighteen billion, three hundred ninety-seven million, three hundred seventy-four thousand, four hundred fifty".