669853 has 2 divisors, whose sum is σ = 669854. Its totient is φ = 669852.

The previous prime is 669847. The next prime is 669857. The reversal of 669853 is 358966.

669853 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 669124 + 729 = 818^2 + 27^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669857) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334926 + 334927.

It is an arithmetic number, because the mean of its divisors is an integer number (334927).

2⁶⁶⁹⁸⁵³ is an apocalyptic number.

It is an amenable number.

669853 is a deficient number, since it is larger than the sum of its proper divisors (1).

669853 is an equidigital number, since it uses as much as digits as its factorization.

669853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 669853 is about 818.4454777198. The cubic root of 669853 is about 87.4970012578.

The spelling of 669853 in words is "six hundred sixty-nine thousand, eight hundred fifty-three".