243123454520 has 32 divisors (see below), whose sum is σ = 547380151920. Its totient is φ = 97186736640.

The previous prime is 243123454493. The next prime is 243123454589. The reversal of 243123454520 is 25454321342.

It is a happy number.

It is a congruent number.

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, 1894766 + ... + 2019005.

Almost surely, 2^243123454520 is an apocalyptic number.

243123454520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243123454520 is an abundant number, since it is smaller than the sum of its proper divisors (304256697400).

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

243123454520 is a wasteful number, since it uses less digits than its factorization.

243123454520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3915335 (or 3915331 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 243123454520 its reverse (25454321342), we get a palindrome (268577775862).

The spelling of 243123454520 in words is "two hundred forty-three billion, one hundred twenty-three million, four hundred fifty-four thousand, five hundred twenty".