87117288816618 has 24 divisors (see below), whose sum is σ = 188841471585156. Its totient is φ = 29025658454400.

The previous prime is 87117288816617. The next prime is 87117288816647. The reversal of 87117288816618 is 81661888271178.

It can be written as a sum of positive squares in 2 ways, for example, as 80583063915249 + 6534224901369 = 8976807^2 + 2556213^2 .

It is not an unprimeable number, because it can be changed into a prime (87117288816617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1119778173 + ... + 1119855968.

Almost surely, 2^{87117288816618} is an apocalyptic number.

87117288816618 is an abundant number, since it is smaller than the sum of its proper divisors (101724182768538).

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

87117288816618 is a wasteful number, since it uses less digits than its factorization.

87117288816618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2239636310 (or 2239636307 counting only the distinct ones).

The product of its digits is 115605504, while the sum is 72.

The spelling of 87117288816618 in words is "eighty-seven trillion, one hundred seventeen billion, two hundred eighty-eight million, eight hundred sixteen thousand, six hundred eighteen".