18454351783920 has 320 divisors, whose sum is σ = 64330726569984. Its totient is φ = 4342203740160.

The previous prime is 18454351783871. The next prime is 18454351783927. The reversal of 18454351783920 is 2938715345481.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18454351783927) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 108344262 + ... + 108514458.

Almost surely, 2^{18454351783920} is an apocalyptic number.

18454351783920 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 18454351783920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32165363284992).

18454351783920 is an abundant number, since it is smaller than the sum of its proper divisors (45876374786064).

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

18454351783920 is a wasteful number, since it uses less digits than its factorization.

18454351783920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171760 (or 171754 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 60.

The spelling of 18454351783920 in words is "eighteen trillion, four hundred fifty-four billion, three hundred fifty-one million, seven hundred eighty-three thousand, nine hundred twenty".