665077 has 10 divisors (see below), whose sum is σ = 778678. Its totient is φ = 568008.

The previous prime is 665069. The next prime is 665089. The reversal of 665077 is 770566.

It can be written as a sum of positive squares in only one way, i.e., 470596 + 194481 = 686^2 + 441^2 .

It is not a de Polignac number, because 665077 - 2³ = 665069 is a prime.

It is a Duffinian number.

665077 is a lucky number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2263 + ... + 2539.

2⁶⁶⁵⁰⁷⁷ is an apocalyptic number.

It is an amenable number.

665077 is a deficient number, since it is larger than the sum of its proper divisors (113601).

665077 is an frugal number, since it uses more digits than its factorization.

665077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 665077 is about 815.5225318776. The cubic root of 665077 is about 87.2885561238.

The spelling of 665077 in words is "six hundred sixty-five thousand, seventy-seven".