665655111 has 32 divisors (see below), whose sum is σ = 1139097600. Its totient is φ = 379693440.

The previous prime is 665655097. The next prime is 665655127. The reversal of 665655111 is 111556566.

It is not a de Polignac number, because 665655111 - 2⁵ = 665655079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665655181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60871 + ... + 70968.

It is an arithmetic number, because the mean of its divisors is an integer number (35596800).

Almost surely, 2^665655111 is an apocalyptic number.

665655111 is a deficient number, since it is larger than the sum of its proper divisors (473442489).

665655111 is a wasteful number, since it uses less digits than its factorization.

665655111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131876 (or 131870 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 665655111 is about 25800.2928471752. The cubic root of 665655111 is about 873.1384034414.

The spelling of 665655111 in words is "six hundred sixty-five million, six hundred fifty-five thousand, one hundred eleven".