667801 has 2 divisors, whose sum is σ = 667802. Its totient is φ = 667800.

The previous prime is 667781. The next prime is 667817. The reversal of 667801 is 108766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 491401 + 176400 = 701^2 + 420^2 .

It is a cyclic number.

It is not a de Polignac number, because 667801 - 2⁵ = 667769 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667801.

It is not a weakly prime, because it can be changed into another prime (667861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333900 + 333901.

It is an arithmetic number, because the mean of its divisors is an integer number (333901).

2⁶⁶⁷⁸⁰¹ is an apocalyptic number.

It is an amenable number.

667801 is a deficient number, since it is larger than the sum of its proper divisors (1).

667801 is an equidigital number, since it uses as much as digits as its factorization.

667801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 667801 is about 817.1909201649. The cubic root of 667801 is about 87.4075649710.

The spelling of 667801 in words is "six hundred sixty-seven thousand, eight hundred one".