243120055505 has 16 divisors (see below), whose sum is σ = 307145637120. Its totient is φ = 184231438848.

The previous prime is 243120055403. The next prime is 243120055523. The reversal of 243120055505 is 505550021342.

It is a cyclic number.

It is not a de Polignac number, because 243120055505 - 2¹² = 243120051409 is a prime.

It is a super-2 number, since 2×243120055505² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445889 + ... + 827681.

It is an arithmetic number, because the mean of its divisors is an integer number (19196602320).

Almost surely, 2^243120055505 is an apocalyptic number.

It is an amenable number.

243120055505 is a deficient number, since it is larger than the sum of its proper divisors (64025581615).

243120055505 is a wasteful number, since it uses less digits than its factorization.

243120055505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388520.

The product of its (nonzero) digits is 30000, while the sum is 32.

Adding to 243120055505 its reverse (505550021342), we get a palindrome (748670076847).

The spelling of 243120055505 in words is "two hundred forty-three billion, one hundred twenty million, fifty-five thousand, five hundred five".