243420543440 has 20 divisors (see below), whose sum is σ = 565952763684. Its totient is φ = 97368217344.

The previous prime is 243420543341. The next prime is 243420543463. The reversal of 243420543440 is 44345024342.

It can be written as a sum of positive squares in 2 ways, for example, as 83641267264 + 159779276176 = 289208^2 + 399724^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 243420543440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1521378317 + ... + 1521378476.

Almost surely, 2^243420543440 is an apocalyptic number.

243420543440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243420543440 is an abundant number, since it is smaller than the sum of its proper divisors (322532220244).

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

243420543440 is a wasteful number, since it uses less digits than its factorization.

243420543440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3042756806 (or 3042756800 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 35.

Adding to 243420543440 its reverse (44345024342), we get a palindrome (287765567782).

The spelling of 243420543440 in words is "two hundred forty-three billion, four hundred twenty million, five hundred forty-three thousand, four hundred forty".