6665601111 has 32 divisors (see below), whose sum is σ = 10167026688. Its totient is φ = 3848087040.

The previous prime is 6665601091. The next prime is 6665601113. The reversal of 6665601111 is 1111065666.

It is not a de Polignac number, because 6665601111 - 2⁵ = 6665601079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665601113) 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, 190030 + ... + 222356.

It is an arithmetic number, because the mean of its divisors is an integer number (317719584).

Almost surely, 2^6665601111 is an apocalyptic number.

6665601111 is a deficient number, since it is larger than the sum of its proper divisors (3501425577).

6665601111 is a wasteful number, since it uses less digits than its factorization.

6665601111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32671.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 6665601111 is about 81643.1326628272. The cubic root of 6665601111 is about 1881.9717797920.

Adding to 6665601111 its reverse (1111065666), we get a palindrome (7776666777).

The spelling of 6665601111 in words is "six billion, six hundred sixty-five million, six hundred one thousand, one hundred eleven".