216709061186618 has 64 divisors (see below), whose sum is σ = 436463079333120. Its totient is φ = 77934813811200.

The previous prime is 216709061186543. The next prime is 216709061186707. The reversal of 216709061186618 is 816681160907612.

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 31 ways as a sum of consecutive naturals, for example, 60976628 + ... + 64432656.

It is an arithmetic number, because the mean of its divisors is an integer number (6819735614580).

Almost surely, 2^{216709061186618} is an apocalyptic number.

216709061186618 is an abundant number, since it is smaller than the sum of its proper divisors (219754018146502).

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

216709061186618 is a wasteful number, since it uses less digits than its factorization.

216709061186618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3487383.

The product of its (nonzero) digits is 10450944, while the sum is 62.

The spelling of 216709061186618 in words is "two hundred sixteen trillion, seven hundred nine billion, sixty-one million, one hundred eighty-six thousand, six hundred eighteen".