18474808453920 has 3456 divisors, whose sum is σ = 88205379494400. Its totient is φ = 3512269651968.

The previous prime is 18474808453873. The next prime is 18474808453921. The reversal of 18474808453920 is 2935480847481.

It is a happy number.

18474808453920 is a `hidden beast` number, since 1 + 8 + 4 + 7 + 480 + 84 + 53 + 9 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (18474808453921) by changing a digit.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 275743409727 + ... + 275743409793.

It is an arithmetic number, because the mean of its divisors is an integer number (25522389900).

Almost surely, 2^{18474808453920} is an apocalyptic number.

18474808453920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18474808453920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44102689747200).

18474808453920 is an abundant number, since it is smaller than the sum of its proper divisors (69730571040480).

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

18474808453920 is a wasteful number, since it uses less digits than its factorization.

18474808453920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 61931520, while the sum is 63.

The spelling of 18474808453920 in words is "eighteen trillion, four hundred seventy-four billion, eight hundred eight million, four hundred fifty-three thousand, nine hundred twenty".