665042311 has 4 divisors (see below), whose sum is σ = 665277624. Its totient is φ = 664807000.

The previous prime is 665042293. The next prime is 665042369. The reversal of 665042311 is 113240566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665042311 - 2¹¹ = 665040263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665042311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665042011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113365 + ... + 119086.

It is an arithmetic number, because the mean of its divisors is an integer number (166319406).

Almost surely, 2^665042311 is an apocalyptic number.

665042311 is a deficient number, since it is larger than the sum of its proper divisors (235313).

665042311 is a wasteful number, since it uses less digits than its factorization.

665042311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235312.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 665042311 is about 25788.4142785089. The cubic root of 665042311 is about 872.8703850236.

Adding to 665042311 its reverse (113240566), we get a palindrome (778282877).

The spelling of 665042311 in words is "six hundred sixty-five million, forty-two thousand, three hundred eleven".