243681240765 has 32 divisors (see below), whose sum is σ = 408279490560. Its totient is φ = 123873431616.

The previous prime is 243681240743. The next prime is 243681240769. The reversal of 243681240765 is 567042186342.

It is not a de Polignac number, because 243681240765 - 2¹³ = 243681232573 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243681240769) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1150285 + ... + 1345554.

It is an arithmetic number, because the mean of its divisors is an integer number (12758734080).

Almost surely, 2^243681240765 is an apocalyptic number.

It is an amenable number.

243681240765 is a deficient number, since it is larger than the sum of its proper divisors (164598249795).

243681240765 is a wasteful number, since it uses less digits than its factorization.

243681240765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496153.

The product of its (nonzero) digits is 1935360, while the sum is 48.

The spelling of 243681240765 in words is "two hundred forty-three billion, six hundred eighty-one million, two hundred forty thousand, seven hundred sixty-five".