243155055140 has 24 divisors (see below), whose sum is σ = 513217632312. Its totient is φ = 96768304640.

The previous prime is 243155055131. The next prime is 243155055193. The reversal of 243155055140 is 41550551342.

It can be written as a sum of positive squares in 4 ways, for example, as 176784929764 + 66370125376 = 420458^2 + 257624^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 243155055140.

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, 30853301 + ... + 30861180.

It is an arithmetic number, because the mean of its divisors is an integer number (21384068013).

Almost surely, 2^243155055140 is an apocalyptic number.

243155055140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243155055140 is an abundant number, since it is smaller than the sum of its proper divisors (270062577172).

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

243155055140 is a wasteful number, since it uses less digits than its factorization.

243155055140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61714687 (or 61714685 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

The spelling of 243155055140 in words is "two hundred forty-three billion, one hundred fifty-five million, fifty-five thousand, one hundred forty".