669673 has 2 divisors, whose sum is σ = 669674. Its totient is φ = 669672.

The previous prime is 669667. The next prime is 669677. The reversal of 669673 is 376966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 451584 + 218089 = 672^2 + 467^2 .

It is a cyclic number.

It is not a de Polignac number, because 669673 - 2¹³ = 661481 is a prime.

It is not a weakly prime, because it can be changed into another prime (669677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334836 + 334837.

It is an arithmetic number, because the mean of its divisors is an integer number (334837).

2⁶⁶⁹⁶⁷³ is an apocalyptic number.

It is an amenable number.

669673 is a deficient number, since it is larger than the sum of its proper divisors (1).

669673 is an equidigital number, since it uses as much as digits as its factorization.

669673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 37.

The square root of 669673 is about 818.3355057677. The cubic root of 669673 is about 87.4891632838.

Subtracting from 669673 its product of digits (40824), we obtain a square (628849 = 793²).

The spelling of 669673 in words is "six hundred sixty-nine thousand, six hundred seventy-three".