669086179218 has 18 divisors (see below), whose sum is σ = 1449694240839. Its totient is φ = 223027569612.

The previous prime is 669086179001. The next prime is 669086179283. The reversal of 669086179218 is 812971680966.

669086179218 is a `hidden beast` number, since 6 + 6 + 9 + 0 + 8 + 617 + 9 + 2 + 1 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 334543089609 + 334543089609 = 578397^2 + 578397^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=578397.

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, 3373983 + ... + 3566781.

Almost surely, 2^669086179218 is an apocalyptic number.

669086179218 is an abundant number, since it is smaller than the sum of its proper divisors (780608061621).

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

669086179218 is an frugal number, since it uses more digits than its factorization.

669086179218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385606 (or 192804 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 63.

The spelling of 669086179218 in words is "six hundred sixty-nine billion, eighty-six million, one hundred seventy-nine thousand, two hundred eighteen".