646577 has 2 divisors, whose sum is σ = 646578. Its totient is φ = 646576.

The previous prime is 646573. The next prime is 646609. The reversal of 646577 is 775646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519841 + 126736 = 721^2 + 356^2 .

It is a cyclic number.

It is not a de Polignac number, because 646577 - 2² = 646573 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (646571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323288 + 323289.

It is an arithmetic number, because the mean of its divisors is an integer number (323289).

2⁶⁴⁶⁵⁷⁷ is an apocalyptic number.

It is an amenable number.

646577 is a deficient number, since it is larger than the sum of its proper divisors (1).

646577 is an equidigital number, since it uses as much as digits as its factorization.

646577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 35.

The square root of 646577 is about 804.1001181445. The cubic root of 646577 is about 86.4715845498.

The spelling of 646577 in words is "six hundred forty-six thousand, five hundred seventy-seven".