243155041240 has 128 divisors (see below), whose sum is σ = 590994740160. Its totient is φ = 89703972864.

The previous prime is 243155041211. The next prime is 243155041249. The reversal of 243155041240 is 42140551342.

It is a super-2 number, since 2×243155041240² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243155041249) 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, 8779254 + ... + 8806906.

Almost surely, 2^243155041240 is an apocalyptic number.

243155041240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243155041240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295497370080).

243155041240 is an abundant number, since it is smaller than the sum of its proper divisors (347839698920).

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

243155041240 is a wasteful number, since it uses less digits than its factorization.

243155041240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27941 (or 27937 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 243155041240 its reverse (42140551342), we get a palindrome (285295592582).

The spelling of 243155041240 in words is "two hundred forty-three billion, one hundred fifty-five million, forty-one thousand, two hundred forty".