243305554440 has 128 divisors (see below), whose sum is σ = 787218445440. Its totient is φ = 59802648576.

The previous prime is 243305554439. The next prime is 243305554469. The reversal of 243305554440 is 44455503342.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 951304 + ... + 1179656.

It is an arithmetic number, because the mean of its divisors is an integer number (6150144105).

Almost surely, 2^243305554440 is an apocalyptic number.

243305554440 is a gapful number since it is divisible by the number (20) 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 243305554440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (393609222720).

243305554440 is an abundant number, since it is smaller than the sum of its proper divisors (543912891000).

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

243305554440 is a wasteful number, since it uses less digits than its factorization.

243305554440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229063 (or 229059 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 39.

The spelling of 243305554440 in words is "two hundred forty-three billion, three hundred five million, five hundred fifty-four thousand, four hundred forty".