243438537456 has 320 divisors, whose sum is σ = 766254349440. Its totient is φ = 73696296960.

The previous prime is 243438537427. The next prime is 243438537467. The reversal of 243438537456 is 654735834342.

243438537456 is a `hidden beast` number, since 2 + 4 + 34 + 38 + 537 + 45 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23738026 + ... + 23748278.

It is an arithmetic number, because the mean of its divisors is an integer number (2394544842).

Almost surely, 2^243438537456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243438537456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383127174720).

243438537456 is an abundant number, since it is smaller than the sum of its proper divisors (522815811984).

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

243438537456 is a wasteful number, since it uses less digits than its factorization.

243438537456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10401 (or 10389 counting only the distinct ones).

The product of its digits is 29030400, while the sum is 54.

The spelling of 243438537456 in words is "two hundred forty-three billion, four hundred thirty-eight million, five hundred thirty-seven thousand, four hundred fifty-six".