243557055 has 48 divisors (see below), whose sum is σ = 492770304. Its totient is φ = 108964800.

The previous prime is 243557033. The next prime is 243557059. The reversal of 243557055 is 550755342.

243557055 is a `hidden beast` number, since 2 + 4 + 35 + 570 + 55 = 666.

It is not a de Polignac number, because 243557055 - 2⁸ = 243556799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243557059) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6580 + ... + 23030.

It is an arithmetic number, because the mean of its divisors is an integer number (10266048).

Almost surely, 2^243557055 is an apocalyptic number.

243557055 is an abundant number, since it is smaller than the sum of its proper divisors (249213249).

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

243557055 is a wasteful number, since it uses less digits than its factorization.

243557055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16516 (or 16513 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 36.

The square root of 243557055 is about 15606.3145873714. The cubic root of 243557055 is about 624.5016229648.

The spelling of 243557055 in words is "two hundred forty-three million, five hundred fifty-seven thousand, fifty-five".