665605116055 has 32 divisors (see below), whose sum is σ = 887026567680. Its totient is φ = 475377409920.

The previous prime is 665605116049. The next prime is 665605116083. The reversal of 665605116055 is 550611506566.

It is not a de Polignac number, because 665605116055 - 2²⁵ = 665571561623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665605115996 and 665605116014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3031857 + ... + 3243973.

It is an arithmetic number, because the mean of its divisors is an integer number (27719580240).

Almost surely, 2^665605116055 is an apocalyptic number.

665605116055 is a deficient number, since it is larger than the sum of its proper divisors (221421451625).

665605116055 is a wasteful number, since it uses less digits than its factorization.

665605116055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213159.

The product of its (nonzero) digits is 810000, while the sum is 46.

It can be divided in two parts, 66560511 and 6055, that added together give a palindrome (66566566).

The spelling of 665605116055 in words is "six hundred sixty-five billion, six hundred five million, one hundred sixteen thousand, fifty-five".