228559661618 has 18 divisors (see below), whose sum is σ = 355099663191. Its totient is φ = 110329681504.

The previous prime is 228559661597. The next prime is 228559661621. The reversal of 228559661618 is 816166955822.

It can be written as a sum of positive squares in 5 ways, for example, as 172230810049 + 56328851569 = 415007^2 + 237337^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=338053.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19601246 + ... + 19612902.

Almost surely, 2^228559661618 is an apocalyptic number.

228559661618 is a deficient number, since it is larger than the sum of its proper divisors (126540001573).

228559661618 is an frugal number, since it uses more digits than its factorization.

228559661618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23374 (or 11688 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 59.

The spelling of 228559661618 in words is "two hundred twenty-eight billion, five hundred fifty-nine million, six hundred sixty-one thousand, six hundred eighteen".