243933257640 has 32 divisors (see below), whose sum is σ = 731799773280. Its totient is φ = 65048868672.

The previous prime is 243933257629. The next prime is 243933257663. The reversal of 243933257640 is 46752339342.

243933257640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 243933257640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1016388454 + ... + 1016388693.

It is an arithmetic number, because the mean of its divisors is an integer number (22868742915).

Almost surely, 2^243933257640 is an apocalyptic number.

243933257640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243933257640 is an abundant number, since it is smaller than the sum of its proper divisors (487866515640).

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

243933257640 is a wasteful number, since it uses less digits than its factorization.

243933257640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032777161 (or 2032777157 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 48.

The spelling of 243933257640 in words is "two hundred forty-three billion, nine hundred thirty-three million, two hundred fifty-seven thousand, six hundred forty".