665011311 has 8 divisors (see below), whose sum is σ = 887544240. Its totient is φ = 442909632.

The previous prime is 665011307. The next prime is 665011327. The reversal of 665011311 is 113110566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665011311 - 2² = 665011307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665011301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104196 + ... + 110393.

It is an arithmetic number, because the mean of its divisors is an integer number (110943030).

Almost surely, 2^665011311 is an apocalyptic number.

665011311 is a deficient number, since it is larger than the sum of its proper divisors (222532929).

665011311 is a wasteful number, since it uses less digits than its factorization.

665011311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215625.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 665011311 is about 25787.8132264060. The cubic root of 665011311 is about 872.8568222763.

Adding to 665011311 its reverse (113110566), we get a palindrome (778121877).

The spelling of 665011311 in words is "six hundred sixty-five million, eleven thousand, three hundred eleven".