665133777 has 48 divisors (see below), whose sum is σ = 1204265088. Its totient is φ = 343664640.

The previous prime is 665133769. The next prime is 665133787. The reversal of 665133777 is 777331566.

It is a happy number.

665133777 is a `hidden beast` number, since 66 + 513 + 3 + 7 + 77 = 666.

It is not a de Polignac number, because 665133777 - 2³ = 665133769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665133787) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 131263 + ... + 136235.

It is an arithmetic number, because the mean of its divisors is an integer number (25088856).

Almost surely, 2^665133777 is an apocalyptic number.

It is an amenable number.

665133777 is a deficient number, since it is larger than the sum of its proper divisors (539131311).

665133777 is a wasteful number, since it uses less digits than its factorization.

665133777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5190 (or 5187 counting only the distinct ones).

The product of its digits is 555660, while the sum is 45.

The square root of 665133777 is about 25790.1876107949. The cubic root of 665133777 is about 872.9103996720.

The spelling of 665133777 in words is "six hundred sixty-five million, one hundred thirty-three thousand, seven hundred seventy-seven".