669667 has 2 divisors, whose sum is σ = 669668. Its totient is φ = 669666.

The previous prime is 669661. The next prime is 669673. The reversal of 669667 is 766966.

It is a balanced prime because it is at equal distance from previous prime (669661) and next prime (669673).

It is a cyclic number.

It is not a de Polignac number, because 669667 - 2³ = 669659 is a prime.

It is not a weakly prime, because it can be changed into another prime (669661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334833 + 334834.

It is an arithmetic number, because the mean of its divisors is an integer number (334834).

2⁶⁶⁹⁶⁶⁷ is an apocalyptic number.

669667 is a deficient number, since it is larger than the sum of its proper divisors (1).

669667 is an equidigital number, since it uses as much as digits as its factorization.

669667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 40.

The square root of 669667 is about 818.3318397814. The cubic root of 669667 is about 87.4889019938.

The spelling of 669667 in words is "six hundred sixty-nine thousand, six hundred sixty-seven".