667769 has 2 divisors, whose sum is σ = 667770. Its totient is φ = 667768.

The previous prime is 667753. The next prime is 667781. The reversal of 667769 is 967766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 619369 + 48400 = 787^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 667769 - 2⁴ = 667753 is a prime.

It is a super-2 number, since 2×667769² = 891830874722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (660769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333884 + 333885.

It is an arithmetic number, because the mean of its divisors is an integer number (333885).

2⁶⁶⁷⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

667769 is a deficient number, since it is larger than the sum of its proper divisors (1).

667769 is an equidigital number, since it uses as much as digits as its factorization.

667769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 41.

The square root of 667769 is about 817.1713406624. The cubic root of 667769 is about 87.4061688032.

The spelling of 667769 in words is "six hundred sixty-seven thousand, seven hundred sixty-nine".