666666055 has 16 divisors (see below), whose sum is σ = 874053504. Its totient is φ = 484110880.

The previous prime is 666666031. The next prime is 666666071. The reversal of 666666055 is 550666666.

666666055 = 11545² + 11546² + ... + 11549².

666666055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666666055 - 2²³ = 658277447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666665996 and 666666014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28692 + ... + 46438.

It is an arithmetic number, because the mean of its divisors is an integer number (54628344).

Almost surely, 2^666666055 is an apocalyptic number.

666666055 is a deficient number, since it is larger than the sum of its proper divisors (207387449).

666666055 is a wasteful number, since it uses less digits than its factorization.

666666055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18446.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The square root of 666666055 is about 25819.8771298393. The cubic root of 666666055 is about 873.5801975662.

The spelling of 666666055 in words is "six hundred sixty-six million, six hundred sixty-six thousand, fifty-five".