243545424520 has 16 divisors (see below), whose sum is σ = 547977205260. Its totient is φ = 97418169792.

The previous prime is 243545424481. The next prime is 243545424539. The reversal of 243545424520 is 25424545342.

It can be written as a sum of positive squares in 2 ways, for example, as 214133860516 + 29411564004 = 462746^2 + 171498^2 .

It is a super-3 number, since 3×243545424520³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 6088635613 = 243545424520 / (2 + 4 + 3 + 5 + 4 + 5 + 4 + 2 + 4 + 5 + 2 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3044317767 + ... + 3044317846.

Almost surely, 2^243545424520 is an apocalyptic number.

243545424520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243545424520 is an abundant number, since it is smaller than the sum of its proper divisors (304431780740).

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

243545424520 is a wasteful number, since it uses less digits than its factorization.

243545424520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6088635624 (or 6088635620 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 40.

Adding to 243545424520 its reverse (25424545342), we get a palindrome (268969969862).

The spelling of 243545424520 in words is "two hundred forty-three billion, five hundred forty-five million, four hundred twenty-four thousand, five hundred twenty".