669684855 has 16 divisors (see below), whose sum is σ = 1224566784. Its totient is φ = 306141600.

The previous prime is 669684853. The next prime is 669684877. The reversal of 669684855 is 558486966.

It is a happy number.

It is not a de Polignac number, because 669684855 - 2¹ = 669684853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 669684795 and 669684804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669684853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3188871 + ... + 3189080.

It is an arithmetic number, because the mean of its divisors is an integer number (76535424).

Almost surely, 2^669684855 is an apocalyptic number.

669684855 is a deficient number, since it is larger than the sum of its proper divisors (554881929).

669684855 is a wasteful number, since it uses less digits than its factorization.

669684855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6377966.

The product of its digits is 12441600, while the sum is 57.

The square root of 669684855 is about 25878.2699383092. The cubic root of 669684855 is about 874.8967954467.

The spelling of 669684855 in words is "six hundred sixty-nine million, six hundred eighty-four thousand, eight hundred fifty-five".