669577 has 2 divisors, whose sum is σ = 669578. Its totient is φ = 669576.

The previous prime is 669551. The next prime is 669607. The reversal of 669577 is 775966.

669577 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 665856 + 3721 = 816^2 + 61^2 .

It is a cyclic number.

It is not a de Polignac number, because 669577 - 2¹⁵ = 636809 is a prime.

It is not a weakly prime, because it can be changed into another prime (669527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334788 + 334789.

It is an arithmetic number, because the mean of its divisors is an integer number (334789).

2⁶⁶⁹⁵⁷⁷ is an apocalyptic number.

It is an amenable number.

669577 is a deficient number, since it is larger than the sum of its proper divisors (1).

669577 is an equidigital number, since it uses as much as digits as its factorization.

669577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 40.

The square root of 669577 is about 818.2768480166. The cubic root of 669577 is about 87.4849824567.

It can be divided in two parts, 6695 and 77, that multiplied together give a palindrome (515515).

The spelling of 669577 in words is "six hundred sixty-nine thousand, five hundred seventy-seven".