669168889146 has 24 divisors (see below), whose sum is σ = 1464221038644. Its totient is φ = 220847817600.

The previous prime is 669168889139. The next prime is 669168889157. The reversal of 669168889146 is 641988861966.

It can be written as a sum of positive squares in 2 ways, for example, as 528798024225 + 140370864921 = 727185^2 + 374661^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184038031 + ... + 184041666.

Almost surely, 2^669168889146 is an apocalyptic number.

669168889146 is an abundant number, since it is smaller than the sum of its proper divisors (795052149498).

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

669168889146 is a wasteful number, since it uses less digits than its factorization.

669168889146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368079806 (or 368079803 counting only the distinct ones).

The product of its digits is 214990848, while the sum is 72.

The spelling of 669168889146 in words is "six hundred sixty-nine billion, one hundred sixty-eight million, eight hundred eighty-nine thousand, one hundred forty-six".