667577 has 2 divisors, whose sum is σ = 667578. Its totient is φ = 667576.

The previous prime is 667561. The next prime is 667631. The reversal of 667577 is 775766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 477481 + 190096 = 691^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 667577 - 2⁴ = 667561 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 667577.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 667577.

It is not a weakly prime, because it can be changed into another prime (667507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333788 + 333789.

It is an arithmetic number, because the mean of its divisors is an integer number (333789).

2⁶⁶⁷⁵⁷⁷ is an apocalyptic number.

It is an amenable number.

667577 is a deficient number, since it is larger than the sum of its proper divisors (1).

667577 is an equidigital number, since it uses as much as digits as its factorization.

667577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61740, while the sum is 38.

The square root of 667577 is about 817.0538537942. The cubic root of 667577 is about 87.3977908596.

The spelling of 667577 in words is "six hundred sixty-seven thousand, five hundred seventy-seven".