666056055 has 64 divisors (see below), whose sum is σ = 1259347968. Its totient is φ = 294243840.

The previous prime is 666056033. The next prime is 666056063. The reversal of 666056055 is 550650666.

It is a happy number.

It is not a de Polignac number, because 666056055 - 2²¹ = 663958903 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 671610 + ... + 672600.

It is an arithmetic number, because the mean of its divisors is an integer number (19677312).

Almost surely, 2^666056055 is an apocalyptic number.

666056055 is a deficient number, since it is larger than the sum of its proper divisors (593291913).

666056055 is a wasteful number, since it uses less digits than its factorization.

666056055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216.

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 666056055 is about 25808.0618218416. The cubic root of 666056055 is about 873.3136740552.

The spelling of 666056055 in words is "six hundred sixty-six million, fifty-six thousand, fifty-five".