664555455 has 16 divisors (see below), whose sum is σ = 1181432160. Its totient is φ = 354429504.

The previous prime is 664555447. The next prime is 664555459. The reversal of 664555455 is 554555466.

664555455 is a `hidden beast` number, since 6 + 6 + 45 + 554 + 55 = 666.

It is not a de Polignac number, because 664555455 - 2³ = 664555447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 664555455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664555459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2461182 + ... + 2461451.

It is an arithmetic number, because the mean of its divisors is an integer number (73839510).

Almost surely, 2^664555455 is an apocalyptic number.

664555455 is a deficient number, since it is larger than the sum of its proper divisors (516876705).

664555455 is a wasteful number, since it uses less digits than its factorization.

664555455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4922647 (or 4922641 counting only the distinct ones).

The product of its digits is 1800000, while the sum is 45.

The square root of 664555455 is about 25778.9731176399. The cubic root of 664555455 is about 872.6573329517.

The spelling of 664555455 in words is "six hundred sixty-four million, five hundred fifty-five thousand, four hundred fifty-five".