669809163728 has 20 divisors (see below), whose sum is σ = 1327935610848. Its totient is φ = 327116102880.

The previous prime is 669809163713. The next prime is 669809163761. The reversal of 669809163728 is 827361908966.

It is a super-3 number, since 3×669809163728³ (a number of 36 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486779228 + ... + 486780603.

Almost surely, 2^669809163728 is an apocalyptic number.

It is an amenable number.

669809163728 is a deficient number, since it is larger than the sum of its proper divisors (658126447120).

669809163728 is a wasteful number, since it uses less digits than its factorization.

669809163728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973559882 (or 973559876 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 65.

The spelling of 669809163728 in words is "six hundred sixty-nine billion, eight hundred nine million, one hundred sixty-three thousand, seven hundred twenty-eight".