222181779618 has 54 divisors (see below), whose sum is σ = 484450492851. Its totient is φ = 73593302400.

The previous prime is 222181779559. The next prime is 222181779641. The reversal of 222181779618 is 816977181222.

222181779618 is a `hidden beast` number, since 2 + 2 + 2 + 1 + 8 + 17 + 7 + 9 + 618 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 128929110489 + 93252669129 = 359067^2 + 305373^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=333303.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 481955908 + ... + 481956368.

Almost surely, 2^222181779618 is an apocalyptic number.

222181779618 is an abundant number, since it is smaller than the sum of its proper divisors (262268713233).

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

222181779618 is an frugal number, since it uses more digits than its factorization.

222181779618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412 (or 707 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The spelling of 222181779618 in words is "two hundred twenty-two billion, one hundred eighty-one million, seven hundred seventy-nine thousand, six hundred eighteen".