423551440000 has 320 divisors, whose sum is σ = 1184949944640. Its totient is φ = 149580288000.

The previous prime is 423551439989. The next prime is 423551440021. The reversal of 423551440000 is 44155324.

It is a tau number, because it is divible by the number of its divisors (320).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 23911147 + ... + 23928853.

It is an arithmetic number, because the mean of its divisors is an integer number (3702968577).

Almost surely, 2^423551440000 is an apocalyptic number.

423551440000 is a gapful number since it is divisible by the number (40) 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 423551440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (592474972320).

423551440000 is an abundant number, since it is smaller than the sum of its proper divisors (761398504640).

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

423551440000 is a wasteful number, since it uses less digits than its factorization.

423551440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17777 (or 17750 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 423551440000 its reverse (44155324), we get a palindrome (423595595324).

The spelling of 423551440000 in words is "four hundred twenty-three billion, five hundred fifty-one million, four hundred forty thousand".