243733263440 has 20 divisors (see below), whose sum is σ = 566679837684. Its totient is φ = 97493305344.

The previous prime is 243733263391. The next prime is 243733263461. The reversal of 243733263440 is 44362337342.

243733263440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 151069032976 + 92664230464 = 388676^2 + 304408^2 .

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

It is a super-2 number, since 2×243733263440² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1523332817 + ... + 1523332976.

Almost surely, 2^243733263440 is an apocalyptic number.

243733263440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243733263440 is an abundant number, since it is smaller than the sum of its proper divisors (322946574244).

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

243733263440 is a wasteful number, since it uses less digits than its factorization.

243733263440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3046665806 (or 3046665800 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 41.

The spelling of 243733263440 in words is "two hundred forty-three billion, seven hundred thirty-three million, two hundred sixty-three thousand, four hundred forty".