243205697312 has 18 divisors (see below), whose sum is σ = 478816708923. Its totient is φ = 121601453792.

The previous prime is 243205697303. The next prime is 243205697323. The reversal of 243205697312 is 213796502342.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 121602848656 + 121602848656 = 348716^2 + 348716^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=348716.

It is a super-2 number, since 2×243205697312² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2746139 + ... + 2833317.

Almost surely, 2^243205697312 is an apocalyptic number.

It is an amenable number.

243205697312 is a deficient number, since it is larger than the sum of its proper divisors (235611011611).

243205697312 is an frugal number, since it uses more digits than its factorization.

243205697312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174368 (or 87181 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 243205697312 in words is "two hundred forty-three billion, two hundred five million, six hundred ninety-seven thousand, three hundred twelve".