123618213618 has 16 divisors (see below), whose sum is σ = 247243203360. Its totient is φ = 41204941856.

The previous prime is 123618213571. The next prime is 123618213629. The reversal of 123618213618 is 816312816321.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 123618213618.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27480 + ... + 497987.

It is an arithmetic number, because the mean of its divisors is an integer number (15452700210).

Almost surely, 2^123618213618 is an apocalyptic number.

123618213618 is an abundant number, since it is smaller than the sum of its proper divisors (123624989742).

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

123618213618 is a wasteful number, since it uses less digits than its factorization.

123618213618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564681.

The product of its digits is 82944, while the sum is 42.

The spelling of 123618213618 in words is "one hundred twenty-three billion, six hundred eighteen million, two hundred thirteen thousand, six hundred eighteen".