664135055 has 4 divisors (see below), whose sum is σ = 796962072. Its totient is φ = 531308040.

The previous prime is 664135033. The next prime is 664135081. The reversal of 664135055 is 550531466.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 664135055 - 2⁸ = 664134799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66413501 + ... + 66413510.

It is an arithmetic number, because the mean of its divisors is an integer number (199240518).

Almost surely, 2^664135055 is an apocalyptic number.

664135055 is a deficient number, since it is larger than the sum of its proper divisors (132827017).

664135055 is a wasteful number, since it uses less digits than its factorization.

664135055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132827016.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 664135055 is about 25770.8178954413. The cubic root of 664135055 is about 872.4732788208.

The spelling of 664135055 in words is "six hundred sixty-four million, one hundred thirty-five thousand, fifty-five".