669684853 has 2 divisors, whose sum is σ = 669684854. Its totient is φ = 669684852.

The previous prime is 669684823. The next prime is 669684877. The reversal of 669684853 is 358486966.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 543729124 + 125955729 = 23318^2 + 11223^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669684853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 669684794 and 669684803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669684823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334842426 + 334842427.

It is an arithmetic number, because the mean of its divisors is an integer number (334842427).

Almost surely, 2^669684853 is an apocalyptic number.

It is an amenable number.

669684853 is a deficient number, since it is larger than the sum of its proper divisors (1).

669684853 is an equidigital number, since it uses as much as digits as its factorization.

669684853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7464960, while the sum is 55.

The square root of 669684853 is about 25878.2698996668. The cubic root of 669684853 is about 874.8967945758.

The spelling of 669684853 in words is "six hundred sixty-nine million, six hundred eighty-four thousand, eight hundred fifty-three".