664442455 has 8 divisors (see below), whose sum is σ = 798998400. Its totient is φ = 530442336.

The previous prime is 664442453. The next prime is 664442479. The reversal of 664442455 is 554244466.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 664442455 - 2¹ = 664442453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664442453) by changing a digit.

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, 136320 + ... + 141109.

It is an arithmetic number, because the mean of its divisors is an integer number (99874800).

Almost surely, 2^664442455 is an apocalyptic number.

664442455 is a deficient number, since it is larger than the sum of its proper divisors (134555945).

664442455 is a wasteful number, since it uses less digits than its factorization.

664442455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277913.

The product of its digits is 460800, while the sum is 40.

The square root of 664442455 is about 25776.7813157500. The cubic root of 664442455 is about 872.6078683722.

The spelling of 664442455 in words is "six hundred sixty-four million, four hundred forty-two thousand, four hundred fifty-five".