665661333 has 32 divisors (see below), whose sum is σ = 992010240. Its totient is φ = 394571520.

The previous prime is 665661313. The next prime is 665661343. The reversal of 665661333 is 333166566.

It is not a de Polignac number, because 665661333 - 2⁸ = 665661077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665661291 and 665661300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665661313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 451788 + ... + 453258.

It is an arithmetic number, because the mean of its divisors is an integer number (31000320).

Almost surely, 2^665661333 is an apocalyptic number.

It is an amenable number.

665661333 is a deficient number, since it is larger than the sum of its proper divisors (326348907).

665661333 is a wasteful number, since it uses less digits than its factorization.

665661333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977.

The product of its digits is 174960, while the sum is 39.

The square root of 665661333 is about 25800.4134269201. The cubic root of 665661333 is about 873.1411238943.

The spelling of 665661333 in words is "six hundred sixty-five million, six hundred sixty-one thousand, three hundred thirty-three".