6664655405 has 8 divisors (see below), whose sum is σ = 7998507384. Its totient is φ = 5331110400.

The previous prime is 6664655369. The next prime is 6664655429. The reversal of 6664655405 is 5045564666.

It can be written as a sum of positive squares in 4 ways, for example, as 2969596036 + 3695059369 = 54494^2 + 60787^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6664655405 - 2⁶ = 6664655341 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6664655405.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 25916 + ... + 118325.

It is an arithmetic number, because the mean of its divisors is an integer number (999813423).

Almost surely, 2^6664655405 is an apocalyptic number.

It is an amenable number.

6664655405 is a deficient number, since it is larger than the sum of its proper divisors (1333851979).

6664655405 is a wasteful number, since it uses less digits than its factorization.

6664655405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153487.

The product of its (nonzero) digits is 2592000, while the sum is 47.

The square root of 6664655405 is about 81637.3407516438. The cubic root of 6664655405 is about 1881.8827717564.

The spelling of 6664655405 in words is "six billion, six hundred sixty-four million, six hundred fifty-five thousand, four hundred five".